I was curious about this. I know Lucas English is running 850s and a single walbro with his setup, but I believe he is maxed out as far as fuel goes. I had 880s/single walbro but am changing to 1000s/dual inline for E85.

 

nice job

 

Lucas has a stocker. I had enough fuel on the stocker at 28 psi , but ever since i switched to green my idc's go over 100% at 6000 rpms and that's with tapering to 21.5 So i have to keep this taper untill i get the dual pumper, which is a bit costly..

 

He does have a stocker, but he also made 430whp on it with E98.

 

wow! That blast of TQ is a beautiful thing

 

So you have the taper because of that or you can't get it to hold more?

I've tuned 24.5-25psi in 3rd gear @ 7400 rpm on a FPgreen, GM boost solenoid, FP WGA, Evo 9

and 24psi or so in in 3rd gear on a FPgreen, GM boost solenoid, stock IX actuator, Evo 9.

Putting a forge high spring actuator in to see if it will give me more boost.

 

Thanks everyone for the kind words. It sure is fun!!

As far as IDC, remember that with the stock ECU you can get by with about 1-2 sizes smaller injectors without tapping out IDC because of the differences in how the stock ECU sprays vs. the AEM EMS . . . If I were running an EMS I would probably need 1000's. . .

The only problem I have seen with driveability so far is that on cold mornings (below 45*) it is hard to start the car. It takes about 4-5 cycles of cranking it over, letting off, cranking again, etc. . . before it finally fires good enough to idle.

EVOlutionary

 

Thanks for the advice, Bryan! No the taper is induced by me in order to keep idc's under 100. I have to drop it after 6000 rpm to 21 by redline.. So it's 28 at 4k , 24 at 6k and 21 by redline. I do have the Forge WGA as well. I once adjusted it so that i got a 29 psi spike on spring pressure alone That was fun. I wanted to see if it will help with taper with MBC, it didn't do much though, so I softened the spring back. It's about 2-3 turns harder than neutral setting now.

 

Have you guys thought that the boost taper could be because the turbo can not blow that much air? You could weld the wastegate shut and I doubt you'd be able to get 30psi over 7K rpms with all the other supporting mods. . .

I could be wrong, just an idea . . .

 

But with a MBC, your bypassing the wastegate for the most part. It's because the turbo is running out of breath up top that you see the taper. Maybe a better wastegate and EBC would help taper, but can't prevent it totally.

Jason

 

Were you at the shootout that was just held by Buschur this past weekend running on E85? I remember seeing a red EVO with switzer on it. Was that yours? If so I was pretty impressed.

What was the best pass you made? I didnt get to stay the entire day.

 

The best way to get rid of the taper is to use an EBC, which is included with our car's ECU. That's what i and a lot of other people are doing.

But Green turbo is not going to be able to keep up though, i have never seen a green hold more than 24-25 by redline.

Welding the wastegate on a green is not a very good idea as you will probably spike to over 30psi. And it'll still taper to 24. It doesn't matter what you do, it can't provide all the air your engine wants at high rpm's.

 

That was my whole point. It's not the boost controller tapering or the WGA, it's just the turbo running out of steam. . .

FWIW, I run the stock 9 WGA and a Hallman MBC . . .

EVOlutionary

 

^ It's a combination. MBC contributes to taper along with a soft spring wga. (assuming that we are talking about high boost here)

 

Yep, I have the red one with lots of graphics and stickers . . .

I ran a new personal best of 11.5 @ 123. That was with a 1.9-2.0 second 60'. Every time I launched the tires would just blaze without the car moving. That's what I get for running the stock Advans in 50 degree temps with over 2* negative camber and a super stiff autocross suspension

I've run 1.6's before, so once I set the car up for drags and get a good launch it should be good for very low 11's at least. . .