Hello all,

ls1 swap done by yours truly. Dyno tested today… I’m happy with numbers but tune guy says restriction at TB and MAF. I want the stock look (as if GM made it)… what can I do about the MAF and TB to get less restrictive?

thanks in advance.

 

Custom front lid. Can increase size slightly but requires some work. Some guys have done it. Maybe worth a few hp on that deal, but I wouldnt worry. If maf was a problem you could delete it and run map sensor only but its working so i wouldnt

ideally you need 3.5-4” intake tube but that wont work with the tpi lid

 

You could duplicate Chad's example in the link below.

https://www.thirdgen.org/forums/fabr...ir-intake.html


There's also this older thing that follows the same theme.

https://www.thirdgen.org/forums/tpi/...pi-camaro.html

 

Sweet car and good results! A+

Had the TPI intake track discussion with Hawk's Motorsports when my 91 RS was resto-mod'd in 2015-16. They said using the TPI intake track was an easy way to lose ~30+ whp on a healthy LS1/LSx etc in their testing.

Hawk's has an intake tube set up, maybe for thr GTO, can remember now. That works well and looks decent.

 

Thank you very much… exactly what I was thinking.

 

Looks very nice. I don’t know why I like the look of the TPI lid. Thank you.

 

I’m going to delete MAF and run it on speed density. Thank you.

 

As others pointed out, that intake is the restriction. It appears your set-up is on the stockish side which would mean your MAF is probably not the issue.

 

Word is that these clear the stock Camaro steel hood.
The early Z28 fibreglass version has to much bulk up at the latch to fit the TPI filter case (in case anyone reading wants to try it on an 82-84 Z).

 

Thank you.

I like the TPI Y as well because it's vintage correct for our 3rd Gen's and looks nice. Wish it didn't hurt hp.

BTW - Speartech did one of the first early (~2001 or ~2002) LS 3rd Gen swaps and discovered the TPI Y hurt whp & ET on an LS1 w/even with a small cam upgrade like a 222/222

 

But not so when modified.
Chad Speier did a flow bench test on his. The results are in the link posted above.
Even when complete with the smallish twin air filters, he reports enough CFM to support his high HP build.
And Chad is a no BS kind of guy from the few interactions I've had with him. (I'd like a set of his cylinder heads if it was ever in the cards...)

 

I can tell you the stock Y with bottoms cut out and ducts run for ram air in the grille did not hurt my 400 whp 383 vs a custom 3.5” CAI with 3.5” maf

 

Having tuned dozens of these systems, there is nothing to be lost with a MAF and a lot to lose if you go speed density. A system with a properly working MAF will run the best. I have a LS3 MAF in a 100mm Spectre housing with a 6:1 SaxonPC straightner that has a perfectly clean signal with 61.5* overlap and a 61.5* IVC. According to some the MAF signal should be so erratic it will not idle. The LS PCMs are so much easier to dial in consistently with dynamic blending of MAF and Speed Density.

Even cold start on a 46F morning was pretty clean. After I made adjustments to keep the 0411 from targeting choke air/fuel ratios of 3:1 for the first 7 seconds.
https://youtu.be/TGxcwd-P06g