capabilty of stock exhaust ports
12-22-05, 08:12 PM
#1
GRINCHY
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capabilty of stock exhaust ports
Guys, it seems like no matter what I do, I can't get past 400rwhp. Looking at
my setup as a whole, the only thing stock is the exhaust ports. What are they
capable of- from your own experience- [not what your buddy's cousin's beeyotch
made].It's a13b rew engine. Thanks guys and merry Christmas.
my setup as a whole, the only thing stock is the exhaust ports. What are they
capable of- from your own experience- [not what your buddy's cousin's beeyotch
made].It's a13b rew engine. Thanks guys and merry Christmas.
12-22-05, 09:05 PM
#3
GRINCHY
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doesn't matter what turbo, hot side etc... 400ishrwhp- currently pt74gts 1.5 bar on.84hotside. Also, that was at 3200ft- around4000 ft corrected. 
Last edited by Xcentric; 12-22-05 at 09:12 PM. Reason: more info
12-22-05, 10:07 PM
#4
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Originally Posted by Xcentric
doesn't matter what turbo, hot side etc... 400ishrwhp- currently pt74gts 1.5 bar on.84hotside. Also, that was at 3200ft- around4000 ft corrected.
the .84 hot side is not the best choice for huge power. Have any 2.5 sections in your exhaust?
things like that will cut some hp.
12-22-05, 10:47 PM
#6
GRINCHY
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yeah, .84 is small, but s wheel flows big. 3 inch exhaust, unhooked on dyno a couple hp
gain. Hell, I put a1.00q trim on a t70, no peak gain. I'm real close to going 20b if
nothing changes. I'm 99% sure I'm gonna port my exhaust and do a monster
street or half bridge.
gain. Hell, I put a1.00q trim on a t70, no peak gain. I'm real close to going 20b if
nothing changes. I'm 99% sure I'm gonna port my exhaust and do a monster
street or half bridge.
12-22-05, 11:27 PM
#7
Weird Cat Man
The PT74 is a monstrous wheel... this compressor measures 2.92 inducer and 4.03 exducer according to their website. That wheel is on par with a T76, which as far as I know, nobody has ever put on any even remotely streetable RX-7.
Your turbine is on par with a Q trim wheel.
You have the completely wrong turbo on this car I'm sorry to say... I am amazed you can spool it at all with stock ports.
If you want big power, you need a street port I think. That turbo is huge and I think you should use a smaller one unless you're just going for pure drag racing.
Your turbine is on par with a Q trim wheel.
You have the completely wrong turbo on this car I'm sorry to say... I am amazed you can spool it at all with stock ports.
If you want big power, you need a street port I think. That turbo is huge and I think you should use a smaller one unless you're just going for pure drag racing.
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12-22-05, 11:47 PM
#8
GRINCHY
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It spools like crazy at about 4000rpm, hits 22psi instantly, I guess b/c of the .84.
I love the turbo- spools waaaaay faster than a t70 1.00q. I also have a 62-1
on a p trim 1.00 housing- great street turbo but same thing, not able to get
over 375-400 out of it. Again, does anyone see 500-600whp out of stock exhaust
ports? And yes, I want to run 10s. BTW isn't aHKS t51kai a 76mm wheel?
I love the turbo- spools waaaaay faster than a t70 1.00q. I also have a 62-1
on a p trim 1.00 housing- great street turbo but same thing, not able to get
over 375-400 out of it. Again, does anyone see 500-600whp out of stock exhaust
ports? And yes, I want to run 10s. BTW isn't aHKS t51kai a 76mm wheel?
Last edited by Xcentric; 12-22-05 at 11:49 PM.
12-24-05, 12:17 AM
#11
GRINCHY
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I'm not about to say that. I think ErnieT ran 10's on a stock reman, and
my friend ran 10's on stock ports. I'm saying I can't seem to get where
they are with stock ports. Maybe I am missing something, I don't think
it's a lack of driving/shifting 'cause I 60ft 1.6s and shift well enough.
I run 10's easily in my blown 98 cobra- won the fastest street shootoff
in it. Just looking at the setup as an air pump and I think the exhaust
ports are a possible restriction. I will do some testing and let you
know. I have a buddy with a shop/ turbo know how.
Plan is to flow the intake and exhaust, then port if needed. then
get a manifold to intake ratio on pressure under boost. Then select
hotside housing to get a good ratio. I think he said 2 to 1 is good-
that is intake to exhaust. We will tune to 25-30 psi. If not happy,
then we will spray that beetotch until our facial muscles contract,
producing a curvature known as a smile
my friend ran 10's on stock ports. I'm saying I can't seem to get where
they are with stock ports. Maybe I am missing something, I don't think
it's a lack of driving/shifting 'cause I 60ft 1.6s and shift well enough.
I run 10's easily in my blown 98 cobra- won the fastest street shootoff
in it. Just looking at the setup as an air pump and I think the exhaust
ports are a possible restriction. I will do some testing and let you
know. I have a buddy with a shop/ turbo know how.
Plan is to flow the intake and exhaust, then port if needed. then
get a manifold to intake ratio on pressure under boost. Then select
hotside housing to get a good ratio. I think he said 2 to 1 is good-
that is intake to exhaust. We will tune to 25-30 psi. If not happy,
then we will spray that beetotch until our facial muscles contract,
producing a curvature known as a smile
12-29-05, 10:42 AM
#17
Will your 3" exhaust system be too restrictive for over 400rwhp? Mandrel bends or normal "squash" bends on it? Are you using straight flow-thru or "turbo" type chamber mufflers? Cat too small?
01-04-06, 12:33 AM
#18
GRINCHY
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Originally Posted by EFINI_RX-7_RZ
Will your 3" exhaust system be too restrictive for over 400rwhp? Mandrel bends or normal "squash" bends on it? Are you using straight flow-thru or "turbo" type chamber mufflers? Cat too small?
I really doubt it is the exhaust.
