Whp gain with:TPIS 90MM intake/90mm TB fully ported??
Lets make a small poll for this one :rock:
I got a 383 and im putting down 490whp/461wtq with a stock untouched ls6 intake and stock untouched 78mm tb.So i was looking to improve my intake. Note: 1-I did not use a Fast 90 or 92 because i had one on my first setup and the lower sheel cracked twice because of the cheap plastic. 2-I did not use a Fast 102 because after some test fit,it was rubbing/hitting my cowl.There is no way i would cut my car for a intake and will not use shorter engine mount. So the TPIS 90mm ls6 was the way to go.A solid ls6 gm base with a 90mm opening.But they are kinda rare in the used market.Ive found one a couple weeks ago for a faire price and bought it.I will use a 90mm ls2 tb.Both will be professionaly ported and the transition between the tb and the intake opening will be seem-less. So simple question: After some tune adjustment ,how much whp should i gain ??? Hoping for at least 20whp :ack: Thanks Eric |
I only picked up 11 rwhp on my heads/cam C5, from about 3,500rpm and up, lost a bit below that though, ported Fast 92/90 and a well respected tuner.....I was hoping for more but I got about what he told me to expect....:(
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Id say 10hp but more importantly 25lbft with additional tuning.
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Well kinda depressing...10whp...
I guess that the 25 torque is something good. |
Would it hurt me a lot by skipping the porting job on the intake ???I mean if spending 125$ + both shipping from canada for a port job is useless i would not do it.
I could just slap the ported ls2 tb on it and thats it.Maybe tring to make a seem-less transition myself but left the intake in stock form. |
Curious what heads you're running?
FWIW here's my results from an LS6 to a 92... http://forums.corvetteforum.com/perf...-maf-10hp.html |
Im running:
PRC LS6(243) stage 2.5 : http://www.texas-speed.com/p-4-prc-s...ted-heads.aspx 383 ci built by TSP(all callies) 11:1 CR Cam: 240/244 ,.615"/.619" @ 113 lsa (EXR lobe) All the support mod(ARH 1 7/8 ,Vararam,morel lifter,manton custom pushrods, etc etc) Built tr6060/c6z diff complete setup,twin disc clutch,adj master,poly tube coupler etc etc) No cheap parts but did wanted to say simple. |
Originally Posted by always faster
(Post 1585388126)
Im running:
PRC LS6(243) stage 2.5 : http://www.texas-speed.com/p-4-prc-s...ted-heads.aspx 383 ci built by TSP(all callies) 11:1 CR Cam: 240/244 ,.615"/.619" @ 113 lsa (EXR lobe) All the support mod(ARH 1 7/8 ,Vararam,morel lifter,manton custom pushrods, etc etc) Built tr6060/c6z diff complete setup,twin disc clutch,adj master,poly tube coupler etc etc) No cheap parts but did wanted to say simple. |
Originally Posted by PRE-Z06
(Post 1585388811)
Sounds like a solid build and the intake is definitely the bottle neck, so you should see some better gains. Have you ever logged your kpa?
I dont know the KPA reading since im do not tune the car. If i can have someting in the 505whp/480wtq minimum range, i ll be happy :cool: |
Did you use the button head bolts on the valley when you had your first fast 90? It's a common problem for people not to install them and they end up cracking the intake.
Anyway, on a 383, you will pick up 30 from 4k and up with a fast/ls2 tb, no doubt about that. I even gained 25 on my little 346. |
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