Thread: EFI Hardware SR20VE ITB's Reviews

I may try to shorten the stack like 1in to see if it helps and dyno again that will be the last chance

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May help a bit to shorten, I have tested as close as 3" from firewall before having any negative effects.

Size is not the problem. Distance from back of valve to throttle plate, port entry and overall design play a big part in making the power. The 50mm was the perfect balance for drivability and power for the smaller bore engines.



That's the LHP 50mm on a 12.5:1 2.0L vs a well flowing plenum.

60mm throttles are being tested on my stock comp 2.0L next.

Big props to Payu for stepping up and spending the $ to test something new. It's never easy or cheap being the first to try things untested. Send some detailed pics next time you have the throttles off.

When do you plan on testing the 60's on the 2.0 ?

LHP

Will call you later today.

Jamie can you take the car tested to a Dynojet after you tune the car on your Dyno so we can compare with results here (Correction factor STD smoothing 5 on 3rd gear if the car has 4.44fd or lower or 4th gear if car has 4.78fd) if its not much trouble with you!!
Thanks!!

No problem, will see where the local Dynojets are.

I shortened my stacks for more clearance and hopefully more top end. WHat i found was that i lost a bunch of bottom/mid range on the butt dyno and 3 lbs of torque but gained 4 WHP. From what im seeing, porting out the bottom and keeping the length of the taperd stacks is the way to go. I do believe it needs more air to scavenge. My plans are to get a 50mm 60 or 90 degree elbow for each stack so they are facing upwards and not towards the firewall. This MAY help but its not sure at this time. I would try this first before cutting the stacks. It's definitely less fun to drive with the shorter stacks. I too had to tap the bottom of the ITB's for a vaccum line btw.

I am going to give them another shot without modifying anything I sync the ITB's correctly yesterday!! I will try to lean afr a little bit more since @ peak power the AFR still on mid 12's and usually this motor used to make peak power @ 13.2-4 also I was used to my IM that didnt get heat soaked so fast I am going to let the car cool a little bit between passes!! I will post the results!!

Good luck man. I know you guys probably don't want but maybe notching the firewall would be an option if this is already a cut up B13. I'm sure you can push the firewall back a couple inches instead of messing with the stack.

Nahh my car its not cut up!! Anyway I think the stacks in these ITB are not the best I think a stack with a bigger throat will improve the top end too

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