Jason's 1990 MR2 project
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This section of the forum is a great resource if you're looking for ideas, and it's a cool way of obtaining technical information that may otherwise not have been posted. (Members can use the Search functionality at top right of the forum to speed up finding things) Please respect others' contributions and don't diss anyone - keep comments helpful, factual, positive and polite. One thread per vehicle or owner please - don't start lots of threads about just one car. And if you need assistance with your car and want to host a spanner day, please use the appropriate section of the forum: http://mr2.org.nz/phpbb3/viewforum.php?f=35 Thank you.
This section of the forum is a great resource if you're looking for ideas, and it's a cool way of obtaining technical information that may otherwise not have been posted. (Members can use the Search functionality at top right of the forum to speed up finding things) Please respect others' contributions and don't diss anyone - keep comments helpful, factual, positive and polite. One thread per vehicle or owner please - don't start lots of threads about just one car. And if you need assistance with your car and want to host a spanner day, please use the appropriate section of the forum: http://mr2.org.nz/phpbb3/viewforum.php?f=35 Thank you.
- EssDub
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Re: Jason's 1990 MR2 project
What kind of response is that? I'm well aware you are using the W2A setup, I merely suggest that the crappy old '89 stuff might have holes/tears in it that could drop that kind of pressure. Why not chuck the W2A box/BOV on and give it a few squirts and see what happens? It's better than nothing and if it works, hey, you know where the problem is.
- JasonFriday13
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Re: Jason's 1990 MR2 project
Yeah, the first few boost tests were with the ct20b, w2a and intake I plan to run on, but I didn't want to melt the w2a core from constant driving, so I installed the air to air system so I could eliminate the intercooler as the problem. Same with the turbo, throttle body and intake manifold. Even replumbing the idle control hose had no effect. Right now the intake tract is completely different to the one I plan to run, just from tracking down this boost problem. I will be swapping out the injector seals to see if that fixes the problem as I know it's leaking from that area of the intake (the petrol test on the intake manifold confirms this).
Sorry if I seem a bit offense, I'm just really frustrated that after 5 weeks I still haven't found this boost problem. It's always been the same, 110 to 115 kpa absolute of boost, spring pressure is about 147 kpa (7 psi). Closed loop boost control is set to 200 kpa (14.7 psi), so I'm going to know about it if it does boost.
Sorry if I seem a bit offense, I'm just really frustrated that after 5 weeks I still haven't found this boost problem. It's always been the same, 110 to 115 kpa absolute of boost, spring pressure is about 147 kpa (7 psi). Closed loop boost control is set to 200 kpa (14.7 psi), so I'm going to know about it if it does boost.
Jason Ross, current cars:
Project: 1990 SW20 GT, 1992+ brake swap, 1992+ subframe swap, 1996 Celica turbo engine swap, 1996 MR2 LSD gearbox swap, Caldina Turbo coil-on-plug ignition, Link G4 Storm, 161kw @ 10psi.
Daily: 2004 Toyota Vitz RS, 1.5L, 5sp
Tow rig: 2009 Camry, 2.4L, auto
Scrapped: 1989 SW20 GT, 1992 SW20 G-Limited, ex EssDub car, donor, 1997 Toyota Tercel 3dr hatch, front crash, 1990 SW20, G-Limited, ex EssDub car, roll crashed, donor
Sold: 1987 AW11 Supercharged, 1991 SW20 G-Limited, ex EssDub car
Project: 1990 SW20 GT, 1992+ brake swap, 1992+ subframe swap, 1996 Celica turbo engine swap, 1996 MR2 LSD gearbox swap, Caldina Turbo coil-on-plug ignition, Link G4 Storm, 161kw @ 10psi.
Daily: 2004 Toyota Vitz RS, 1.5L, 5sp
Tow rig: 2009 Camry, 2.4L, auto
Scrapped: 1989 SW20 GT, 1992 SW20 G-Limited, ex EssDub car, donor, 1997 Toyota Tercel 3dr hatch, front crash, 1990 SW20, G-Limited, ex EssDub car, roll crashed, donor
Sold: 1987 AW11 Supercharged, 1991 SW20 G-Limited, ex EssDub car
- Benckj
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Re: Jason's 1990 MR2 project
Only confirmative way I've found to test intake for pressure leaks was to cap off both ends and apply pressure from external supply. Buy a PVC cap nd tap iinto it a fitting for a tyre nipple plus pressure gauge then join onto induction pipe with silicone joiner. Set your compresser to 15psi and pump air into and listen for leaks. Can also spray engine bay down with soapy water to help pinpoint. Unlike other methods this test it will confirm the holding pressure and find any leaks.
Jim Benck
90 rev 1 parts car
98 rev 5 GT- all the mods
90 rev 1 parts car
98 rev 5 GT- all the mods
- JasonFriday13
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Re: Jason's 1990 MR2 project
So I have swapped out the intakes again so could replace the injector seals.
The old seals at the top, new ones at the bottom. The old ones look good, no splits and still soft and flexible, but I put new ones in anyway.
I went for a drive and still no boost. I still don't know if I am losing boost or not making boost. I have blocked off the blow off valve and that made no difference, but now I can hear the air rushing back past the compressor when coming off the throttle. So where to from here? I know the head gasket is not blown as there is no water in the oil and vice versa, and it doesn't lose water or overheat when trying to thrash it. So this is pointing me to valves not sealing, or (less likely) valve stem seals leaking. So I guess a compression test or/and leak down test is next.
The old seals at the top, new ones at the bottom. The old ones look good, no splits and still soft and flexible, but I put new ones in anyway.
I went for a drive and still no boost. I still don't know if I am losing boost or not making boost. I have blocked off the blow off valve and that made no difference, but now I can hear the air rushing back past the compressor when coming off the throttle. So where to from here? I know the head gasket is not blown as there is no water in the oil and vice versa, and it doesn't lose water or overheat when trying to thrash it. So this is pointing me to valves not sealing, or (less likely) valve stem seals leaking. So I guess a compression test or/and leak down test is next.
Last edited by JasonFriday13 on Mon Jan 25, 2016 1:15 am, edited 1 time in total.
Jason Ross, current cars:
Project: 1990 SW20 GT, 1992+ brake swap, 1992+ subframe swap, 1996 Celica turbo engine swap, 1996 MR2 LSD gearbox swap, Caldina Turbo coil-on-plug ignition, Link G4 Storm, 161kw @ 10psi.
Daily: 2004 Toyota Vitz RS, 1.5L, 5sp
Tow rig: 2009 Camry, 2.4L, auto
Scrapped: 1989 SW20 GT, 1992 SW20 G-Limited, ex EssDub car, donor, 1997 Toyota Tercel 3dr hatch, front crash, 1990 SW20, G-Limited, ex EssDub car, roll crashed, donor
Sold: 1987 AW11 Supercharged, 1991 SW20 G-Limited, ex EssDub car
Project: 1990 SW20 GT, 1992+ brake swap, 1992+ subframe swap, 1996 Celica turbo engine swap, 1996 MR2 LSD gearbox swap, Caldina Turbo coil-on-plug ignition, Link G4 Storm, 161kw @ 10psi.
Daily: 2004 Toyota Vitz RS, 1.5L, 5sp
Tow rig: 2009 Camry, 2.4L, auto
Scrapped: 1989 SW20 GT, 1992 SW20 G-Limited, ex EssDub car, donor, 1997 Toyota Tercel 3dr hatch, front crash, 1990 SW20, G-Limited, ex EssDub car, roll crashed, donor
Sold: 1987 AW11 Supercharged, 1991 SW20 G-Limited, ex EssDub car
- Benckj
- Forum Moderator - MR2OCNZ
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- First name: Jim
Re: Jason's 1990 MR2 project
As mentioned above do an intake pressure test. I'll even loan you the pressure cap if you don't want to build one yourself.
Jim Benck
90 rev 1 parts car
98 rev 5 GT- all the mods
90 rev 1 parts car
98 rev 5 GT- all the mods
- EssDub
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- First name: Graham
Re: Jason's 1990 MR2 project
One other thought, how restrictive is the exhaust on that car? I remember I once fitted a different system to the GT-S at a dyno day and was not even able to reach 5psi under load. Changed back to the 3" one and it was fine again.
-
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Re: Jason's 1990 MR2 project
My money is still on wastegate/actuator or completely blocked exhaust, unless you are so deaf you can't hear one massive boost leak on the intake side. Headgasket would have to be entirely missing to have a leak big enough to prevent you from building boost. Sticky valve should be detectable by pulling plugs, since there would be no compression and resulting poor combustion on that cylinder the plug would have a completely different appearance to a healthy cylinder. Cam timing would have to be miles out to prevent boost and you'd notice that.
Gen 2 GT trackcar: Used and Abused, now getting some TLC.
CL7 Euro R, the fun begins at 6000 rpm
CL7 Euro R, the fun begins at 6000 rpm
- EssDub
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- First name: Graham
Re: Jason's 1990 MR2 project
Drop the exhaust after the downpipe and give it a squirt
Lee - Didn't he replace the turbo/actuator assembly for testing anyway?
Lee - Didn't he replace the turbo/actuator assembly for testing anyway?
- Reuban
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Re: Jason's 1990 MR2 project
I think it still has one of my CT26's on it at the mo'. I'm with you Graham ans Lee, something must be blocked as a MF, i cant think of a bloody thing else this could be.
Do a midnight downpipe only run and record it for us
Do a midnight downpipe only run and record it for us
- EssDub
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Re: Jason's 1990 MR2 project
Jason's shout for Maccas if it is blocked!
- JasonFriday13
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Re: Jason's 1990 MR2 project
Correct, I would rather blow up a CT26 finding this problem, and save the CT20B for later.Reuban wrote:I think it still has one of my CT26's on it at the mo'.
Agreed. Its a new Toyota gasket (3 layer metal) with ARP head studs holding it down.Grrrrrrr! wrote:Headgasket would have to be entirely missing to have a leak big enough to prevent you from building boost.
I have only pulled one plug (No. 4) and it looks completely normal (and clean), I will pull the others for a look too.Grrrrrrr! wrote:Sticky valve should be detectable by pulling plugs, since there would be no compression and resulting poor combustion on that cylinder the plug would have a completely different appearance to a healthy cylinder.
Yeah I am trying to keep the overlap within TDC and relatively small, currently it's 4 degrees.Grrrrrrr! wrote:Cam timing would have to be miles out to prevent boost and you'd notice that.
Good idea, I have a modified NA exhaust on there right now, but I know Kylie at AVS has a custom exhaust that apparently came off Stephen Wolfe's 1992 GT-S, so I'll see if I can borrow it.EssDub wrote:One other thought, how restrictive is the exhaust on that car? I remember I once fitted a different system to the GT-S at a dyno day and was not even able to reach 5psi under load. Changed back to the 3" one and it was fine again.
Thanks guys for the ideas.
Jason Ross, current cars:
Project: 1990 SW20 GT, 1992+ brake swap, 1992+ subframe swap, 1996 Celica turbo engine swap, 1996 MR2 LSD gearbox swap, Caldina Turbo coil-on-plug ignition, Link G4 Storm, 161kw @ 10psi.
Daily: 2004 Toyota Vitz RS, 1.5L, 5sp
Tow rig: 2009 Camry, 2.4L, auto
Scrapped: 1989 SW20 GT, 1992 SW20 G-Limited, ex EssDub car, donor, 1997 Toyota Tercel 3dr hatch, front crash, 1990 SW20, G-Limited, ex EssDub car, roll crashed, donor
Sold: 1987 AW11 Supercharged, 1991 SW20 G-Limited, ex EssDub car
Project: 1990 SW20 GT, 1992+ brake swap, 1992+ subframe swap, 1996 Celica turbo engine swap, 1996 MR2 LSD gearbox swap, Caldina Turbo coil-on-plug ignition, Link G4 Storm, 161kw @ 10psi.
Daily: 2004 Toyota Vitz RS, 1.5L, 5sp
Tow rig: 2009 Camry, 2.4L, auto
Scrapped: 1989 SW20 GT, 1992 SW20 G-Limited, ex EssDub car, donor, 1997 Toyota Tercel 3dr hatch, front crash, 1990 SW20, G-Limited, ex EssDub car, roll crashed, donor
Sold: 1987 AW11 Supercharged, 1991 SW20 G-Limited, ex EssDub car
- JasonFriday13
- Club Member - MR2OCNZ
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- First name: Jason
Re: Jason's 1990 MR2 project
Swapped the stock exhaust out for a turbo exhaust, and:EssDub wrote:One other thought, how restrictive is the exhaust on that car? I remember I once fitted a different system to the GT-S at a dyno day and was not even able to reach 5psi under load. Changed back to the 3" one and it was fine again.
7 psi of boost, and no choking after 5500 rpms, which is weird for a CT26. By the way it takes off, I swear I thought it made more boost than this. I also checked all 4 spark plugs, all look the same, clean and healthy. Oh and the stock exhaust is not blocked, it's just not designed for a turbo dumping through it, which was causing all the back-pressure and no boost.
Last edited by JasonFriday13 on Mon Jan 25, 2016 1:17 am, edited 1 time in total.
Jason Ross, current cars:
Project: 1990 SW20 GT, 1992+ brake swap, 1992+ subframe swap, 1996 Celica turbo engine swap, 1996 MR2 LSD gearbox swap, Caldina Turbo coil-on-plug ignition, Link G4 Storm, 161kw @ 10psi.
Daily: 2004 Toyota Vitz RS, 1.5L, 5sp
Tow rig: 2009 Camry, 2.4L, auto
Scrapped: 1989 SW20 GT, 1992 SW20 G-Limited, ex EssDub car, donor, 1997 Toyota Tercel 3dr hatch, front crash, 1990 SW20, G-Limited, ex EssDub car, roll crashed, donor
Sold: 1987 AW11 Supercharged, 1991 SW20 G-Limited, ex EssDub car
Project: 1990 SW20 GT, 1992+ brake swap, 1992+ subframe swap, 1996 Celica turbo engine swap, 1996 MR2 LSD gearbox swap, Caldina Turbo coil-on-plug ignition, Link G4 Storm, 161kw @ 10psi.
Daily: 2004 Toyota Vitz RS, 1.5L, 5sp
Tow rig: 2009 Camry, 2.4L, auto
Scrapped: 1989 SW20 GT, 1992 SW20 G-Limited, ex EssDub car, donor, 1997 Toyota Tercel 3dr hatch, front crash, 1990 SW20, G-Limited, ex EssDub car, roll crashed, donor
Sold: 1987 AW11 Supercharged, 1991 SW20 G-Limited, ex EssDub car
- EssDub
- Guest of the Club.
- Posts: 3043
- Joined: Mon Oct 03, 2005 9:02 pm
- Stomping Ground: Outside of New Zealand
- Prime Mover: Looking for an MR2
- First name: Graham
Re: Jason's 1990 MR2 project
stock CT26 spring is around 7 pounds.
I'll have a double quarter pounder with frozen coke, next time i'm in town
I'll have a double quarter pounder with frozen coke, next time i'm in town
- JasonFriday13
- Club Member - MR2OCNZ
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- Joined: Mon May 21, 2007 5:19 pm
- Stomping Ground: Taranaki
- Prime Mover: SW20
- First name: Jason
Re: Jason's 1990 MR2 project
With a free ride thrown in .
Jason Ross, current cars:
Project: 1990 SW20 GT, 1992+ brake swap, 1992+ subframe swap, 1996 Celica turbo engine swap, 1996 MR2 LSD gearbox swap, Caldina Turbo coil-on-plug ignition, Link G4 Storm, 161kw @ 10psi.
Daily: 2004 Toyota Vitz RS, 1.5L, 5sp
Tow rig: 2009 Camry, 2.4L, auto
Scrapped: 1989 SW20 GT, 1992 SW20 G-Limited, ex EssDub car, donor, 1997 Toyota Tercel 3dr hatch, front crash, 1990 SW20, G-Limited, ex EssDub car, roll crashed, donor
Sold: 1987 AW11 Supercharged, 1991 SW20 G-Limited, ex EssDub car
Project: 1990 SW20 GT, 1992+ brake swap, 1992+ subframe swap, 1996 Celica turbo engine swap, 1996 MR2 LSD gearbox swap, Caldina Turbo coil-on-plug ignition, Link G4 Storm, 161kw @ 10psi.
Daily: 2004 Toyota Vitz RS, 1.5L, 5sp
Tow rig: 2009 Camry, 2.4L, auto
Scrapped: 1989 SW20 GT, 1992 SW20 G-Limited, ex EssDub car, donor, 1997 Toyota Tercel 3dr hatch, front crash, 1990 SW20, G-Limited, ex EssDub car, roll crashed, donor
Sold: 1987 AW11 Supercharged, 1991 SW20 G-Limited, ex EssDub car
- EssDub
- Guest of the Club.
- Posts: 3043
- Joined: Mon Oct 03, 2005 9:02 pm
- Stomping Ground: Outside of New Zealand
- Prime Mover: Looking for an MR2
- First name: Graham
Re: Jason's 1990 MR2 project
I LIKE THIS.