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91T +SB 50 AFRs? [Archive] - Toyota MR2 Message Board

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91T +SB 50 AFRs? [Archive] - Toyota MR2 Message Board Toyota MR2 Message Board > Toyota MR2 Generations > MK 2 MR2 - SW20 > MK2 Stand-Alone EMS and Nitrous Discussion > 91T +SB 50 AFRs? PDA

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Rassiel05-22-2007, 01:51 PMHello from Spain.
My friend have a '91 US spec MR2 Turbo. with around 120K km (74400 milles)
It has a KO racing SB 50 (external TIAL wastegate, 3" downpipe etc).
Full 3" (inside diameter) exhaust with no silencer (now thats loud :devil: )
Apexi Power intake.
DIY Fuel cut defender.
TMIC with custom 3" piping

The car is being stripped and by the moment it has no AC, no PS, no Heater, no ABS, no radio antenna etc... Should be in less than 1080 Kg (2368lbs?)

The car set to 10 PSi, (standard Tial pressure) is making around 11.5 AFR from 5k to redline.
Putting on a MBC around 11 PSI the car feels totally different. The turbo kicks very hard past 5k revs. But the AFRS get a bit high from here, it runs on low 12s, around 12,5 to the redline.
Arent these too lean?
We did compression test and the result was good, leak test and was around 8% (is that bad?).
Tested the 2 speed on the ful pump and both working.
Tested the standard FPR and seems OK.

Watching simillar setups whe should be running close to 250 WHP but we feel that we are no more than 250 CRANk hp, as the car is not too much faster with such weight compared to other similar cars (190WHP Integra).
We have revised everything and we dont find the loss of HP.
Maybe worm fuel pump?, or are this correct with standard Fuel pressure?
Should we raise the FP? How much can hold the stock fuel rail, without too much problems?

We are now watching for the next upgrade but we are not sure if we have to rebuild the engine or will be ok for a little while and go first for standalone.

What do you think.

Here is a shot of the engine bay.

http://images3.pictiger.com/thumbs/2d/537c8d9e741b68216fbfdb3bcc364b2d.th.jpg (http://server3.pictiger.com/img/909932/cars-and-motors/img-2283.php) Weasy2k05-22-2007, 09:43 PMmost turbo guys run the afrs at around mid 11's to 12:1

12.5 is nothing to be freaked out about but if you can go a bit richer then that would be cool.

Are you running stock injectors with stock ecu? You probably are running at 100% duty cycle and the injectors cant give you anything more... oldster05-22-2007, 09:50 PMI run a SB 46 with TKO downpipe and exhaust and I am out of fuel at 16.5psi. The AFR is running into the 14s. At 15PSI the car made 261RWHP with an AFR of 12 from 5500 through 7500. This with a stock fuel system, injectors and ECU. Rassiel05-23-2007, 08:21 AMAre you running stock injectors with stock ecu? You probably are running at 100% duty cycle and the injectors cant give you anything more...

Stock injectors, ecu and fuel pressure.



I run a SB 46 with TKO downpipe and exhaust and I am out of fuel at 16.5psi. The AFR is running into the 14s. At 15PSI the car made 261RWHP with an AFR of 12 from 5500 through 7500. This with a stock fuel system, injectors and ECU.

oldster, are u running stock fuel pressure?. Watching ur numbers seems that at least we should be able to run high 11s on 11 PSI oldster05-23-2007, 11:13 AMYes, the fuel pressure was stock. Your ET is going to depend on many factors, HP , driving skill, track condition, climate, car weight etc. My best time was a 13.6, best MPH was 102 all running 13PSI and a car weight with driver of 3250. You have an aggressive weight plan that is really going to help your car. Best of luck in your project. Significant05-23-2007, 11:52 AMthats strange... my car hit 13.7 @ 107mph with a really bad 2.2 60ft... i dont think im around 260whp at all... Rassiel05-23-2007, 12:59 PMSorry guys im was not speaking of quartermille. I was speaking of high 11 AFR something like 11,9 AFR. oldster05-23-2007, 10:55 PMthats strange... my car hit 13.7 @ 107mph with a really bad 2.2 60ft... i dont think im around 260whp at all...

Why would you think it strange? Weasy2k05-24-2007, 11:51 AMWell you are defiantly beginning to max out the injection system if you cant keep a lower AFR. Powered by vBulletin® Version 4.2.5 Copyright © 2026 vBulletin Solutions Inc. All rights reserved.

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