RobH 1990 MR2 Turbo Tuning

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robh
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RobH 1990 MR2 Turbo Tuning

Postby robh » Fri Feb 12, 2016 9:35 am

New to MR2's, picked one up from a friend, 1990 rev 1 T-top Turbo.

It already has a CT20B turbo and 2.5" decat downpipe but everything else is stock.

Planning on a dyno run shortly to see what the starting point is.

Then install the following:

KO Racing 2.5" B Pipe
KO Racing Throttle Body Inlet
Link G4 Storm (start with a combination of ST165 base map then tweak with fuel map and cold start settings from ST205)
Larger Gen 3 Injectors
AFM delete
Colder plugs
Gen 3 IAT sensor into Cold Start Injector
Innovate LC-2 wideband

Then run up on dyno for a final tune.

Hopefully nothing goes bang.

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Benckj
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Re: RobH 1990 MR2 Turbo Tuning

Postby Benckj » Fri Feb 12, 2016 9:45 am

Good to see your tunning plans and supporting mods. Couple of comments worth considering;

1/ IC upgrade. Need to look at this as OEM IC won't keep intake temps down. High temps + raised boost= detonation (blown engine).
2/ Gen 2 fuel supply. Depending on your hp goals will need to upgrade FP and gen 2 rail (and possibly FPR). What fuel do you intend to use?
3/ Boost Control. Take it this will be through the Link?
4/ Other; It isn't all about performance. Don't forget if you make the car go faster you need to be able to stop faster. Brakes, tyres, trans, suspension are all important componentes to mod & maintain.

Not sure if you have read 'Powerprimer' but this tells what to expect from mods.

http://www.mrcontrols.com/primers/power.htm

Pics, how about some pic?
Jim Benck
90 rev 1 parts car
98 rev 5 GT- all the mods

robh
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Re: RobH 1990 MR2 Turbo Tuning

Postby robh » Fri Feb 12, 2016 10:52 am

Thanks, yes I've done some reading and I'm not really fussed on what I achieve, just having some fun with it:

1. I/C upgrade, I will do something later, aware it will be a limiting factor, but will just wind boost down to a suitable level, plus with the Link can add an inlet temp boost cut
2. No, don't think this will be needed on stock motor, they reckon a rev 1/2 fuel system good for 270ish rwhp, from what I've read injectors are the limit on early cars and I've got the larger 550cc injectors to install
3. Factory boost control via Link G4, I can add a MAC valve later if needed, have read some people reckon the rev 1 solenoid is not as good as the later ones
4. Agreed, brakes are stock but in good condition, tyres are good, suspension has had stiffer inserts added and strut braces F/R, it actually handles well already, don't think it needs to be lower or stiffer

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Benckj
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Re: RobH 1990 MR2 Turbo Tuning

Postby Benckj » Fri Feb 12, 2016 11:37 am

That's good as its sounds like you have done some research and have a decent plan. The Link will help tune and adapt to mods installed later on. 270whp may be a bit optimistic with fuel rail but will be fun all the same. Just don't be fooled by using AFR's implicitly to tune as center 2 cylinders run hotter & leaner than 1 & 4. Might pay to richen them up a tad to be sure you don't blow a ringland by pushing limits.
Jim Benck
90 rev 1 parts car
98 rev 5 GT- all the mods

robh
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Re: RobH 1990 MR2 Turbo Tuning

Postby robh » Fri Feb 12, 2016 11:51 am

Understood and agree, in fact I've just ordered an 8mm fuel rail for a friend for his ST165 GT4 for exactly that reason.

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Benckj
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Re: RobH 1990 MR2 Turbo Tuning

Postby Benckj » Fri Feb 12, 2016 1:18 pm

Most people either bore out the gen 2 rail or replace with the top feed type. I mention this as you indicated using the gen 3- 540's which are side mount and will fit gen 2 rail. The gen 3 rail will however, not fit the gen 2 head due to different mounting holes. 'Grrrrrrrr' had a write-up a while back on how to bore the rail out which may be good to read.

This link is from another site on installing new rail which can be helpful.

http://www.mrtwo.net/mr2modproject/mod/ ... system.htm
Jim Benck
90 rev 1 parts car
98 rev 5 GT- all the mods

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JasonFriday13
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Re: RobH 1990 MR2 Turbo Tuning

Postby JasonFriday13 » Fri Feb 12, 2016 6:56 pm

robh wrote:3. Factory boost control via Link G4, I can add a MAC valve later if needed, have read some people reckon the rev 1 solenoid is not as good as the later ones

That's not true, the boost solenoid is an on/off type, and it bleeds 3psi off the wastegate pressure (6psi on the gen 3). So you will need a MAC valve to control boost pressure.

Also, the limiting factor on the gen 2 fuel system isn't the injectors, it's the rail. There is a fairly big pressure drop from one end to the other. They fixed this on the gen 3 by boring out a channel around each injector inlet.

Benckj wrote:The gen 3 rail will however, not fit the gen 2 head due to different mounting holes.

This is partially true, the injector spacing is also different.

On a gen 2 engine you can make around 170/180kw with the stock 430cc injectors and a ct20b turbo. Oh, and 2.5 inch downpipes are better suited to ct26 turbos to help stop boost creep. ct20b's don't have a boost creep problem so they can take a 3 inch downpipe with no problems. I have a Berk downpipe on mine, it's great.
Jason Ross, current cars:
Project: 1990 SW20, G-Limited, ex EssDub car, 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: 1997 Toyota Tercel 3dr hatch, petrol 4sp.
Sold: 1991 SW20, G-Limited, ex EssDub car
Scrapped: 1992 SW20, G-Limited, ex EssDub car, donor
Scrapped: 1989 SW20, GT turbo
Sold: 1987 AW11, Supercharged 5sp

robh
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Re: RobH 1990 MR2 Turbo Tuning

Postby robh » Sat Feb 13, 2016 3:44 pm

Dyno'd this morning, current state:

117kw at 8psi, AFR very very rich.

Depending on when all parts turn up I may or may not bother tracking down why the stock ECU isn't allowing high boost. Already checked for boost leaks, ECU fault codes and that TVSV is ok, might just give up and wait until Link G4 is in so I can more easily see what sensor are saying.

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Alsw20
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Re: RobH 1990 MR2 Turbo Tuning

Postby Alsw20 » Sat Feb 13, 2016 4:39 pm

Is the t/vsv still electrically connected? A previous owner hasn't pulled the plug under the car?

That is how I disabled the t/vsv on my old SW20s

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JasonFriday13
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Re: RobH 1990 MR2 Turbo Tuning

Postby JasonFriday13 » Sat Feb 13, 2016 11:40 pm

117kw would be alright for a ct26, but with a ct20b that figure is a bit low. I figured you've probably done stuff like this in the past, so I won't write another essay about car stuff and how it works.
Jason Ross, current cars:
Project: 1990 SW20, G-Limited, ex EssDub car, 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: 1997 Toyota Tercel 3dr hatch, petrol 4sp.
Sold: 1991 SW20, G-Limited, ex EssDub car
Scrapped: 1992 SW20, G-Limited, ex EssDub car, donor
Scrapped: 1989 SW20, GT turbo
Sold: 1987 AW11, Supercharged 5sp