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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 02-10-2006, 03:06 AM   #21
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Quote:
Originally Posted by willwren
The 94/95 Gen3 SC and TB together produce too much flow. And there are too many factory restrictions.

I'm beginning to think that the LIM and EM porting should be a requirement on 94/95 L67'* before a pulley.
Soon enough -I've got uncracked exhaust mani'* to pick up tomorrow and will be getting a good used LIM within the next month and together with my heads (freshened up a bit) they'll be port matched.
Saturday is a definite on getting my 3" DP and 3" HF resonator installed, as well as getting the 2" kink (that was done to make the exhaust fit without my authorization) fixed.
Will also be getting my SS oval resonator tips just like I had on my 98 SSE.
Eventually a Borla muffler will take it'* place, but until then I've decided to keep the stock 97 SSE muffler (as restrictive as it is) to keep things somewhat quiet.
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Old 02-10-2006, 02:54 PM   #22
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We need all the info we can cram into the thread here, we are in uncharted waters that we are trying to chart lol
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Old 02-10-2006, 02:56 PM   #23
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Quote:
Originally Posted by SSEimatt93
lol no such thing as headers for my application lol
all ive heard is..93 SSEi? haha my grandparents owned one of those, headers, nope sorry
lol
That isn't going to be true for much longer, I hope.

Quote:
Originally Posted by Willwren
The 94/95 Gen3 SC and TB together produce too much flow. And there are too many factory restrictions.

I'm beginning to think that the LIM and EM porting should be a requirement on 94/95 L67'* before a pulley.
I'm not sure about the LIM, but I've been giving alot of thought to the exhaust side. I should've mentioned in my PMS Bill that I'm going to be trying out a set of experimental headers that a guy who owns a corvette shop has been playing around with based on my prodding. He'* also looking at cylinder head porting as well.

He has alot of experience with GM V6 and V8 engines so he thinks he'* up to the challenge. I have a set of heads coming from Sqela later this month, and I'm hoping to fish up another set tomorrow as well.
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Old 02-10-2006, 02:59 PM   #24
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Only thing is, i do belive the exhaust manis varied a bit from year to year
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Old 02-10-2006, 03:01 PM   #25
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Quote:
Originally Posted by SSEimatt93
Only thing is, i do belive the exhaust manis varied a bit from year to year
I know. This is going to be a 94/95 solution I bet.
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Old 02-10-2006, 05:12 PM   #26
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Quote:
Originally Posted by Mortehl
Quote:
Originally Posted by SSEimatt93
Only thing is, i do belive the exhaust manis varied a bit from year to year
I know. This is going to be a 94/95 solution I bet.
keep up the good work. I'll be right behind you taking notes

I just want to add one thing to this even though it may have no relevance to the flow issue. I did the BCA mod but instead of making the boost engage sooner I moved it in the other direction to make it come on a little later. I noticed that the car had a very small drop in the low end but gained some midrange power. I am thinking that this has something to do with the boost coming on later while the car is at a higher RPM to use the extra flow we are getting from our 94/95 setup. (If I am incorrect please correct me)
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Old 02-10-2006, 06:05 PM   #27
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Custom headers aren't going to flow much (if any) better than the stock 93-95 ported EM'*. Remember that all 6 cylinders aren't flowing exhaust simultaneously. Sounds like a great expense and trouble for 2-5 horsepower tops?

And when the LIM is FAR more of a restriction to performance?

For those of you who have seen my vid.........I finally checked my fuel pressure today. With a brand new 95 FPR and walbro pump. My pressure is so low it'* LAUGHABLE, but the car still pulls like a raped ape. Why?

EM porting and PRIMARILY LIM porting. But until I get it properly tuned, the Jury is still at lunch break.

Running the BCA mod the other direction will not gain you any midrange power. The only way to do that is a cam. What you're feeling is the DIFFERENCE because you lost on the low end.

The BCA is CLOSED (not bypassed) at WOT. Adjusting the BCA in either direction can only delay or speed up boost response, not total power. It'* WHEN, not how much.
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Old 02-10-2006, 07:45 PM   #28
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Quote:
Originally Posted by willwren
Custom headers aren't going to flow much (if any) better than the stock 93-95 ported EM'*. Remember that all 6 cylinders aren't flowing exhaust simultaneously. Sounds like a great expense and trouble for 2-5 horsepower tops?

And when the LIM is FAR more of a restriction to performance?

For those of you who have seen my vid.........I finally checked my fuel pressure today. With a brand new 95 FPR and walbro pump. My pressure is so low it'* LAUGHABLE, but the car still pulls like a raped ape. Why?

EM porting and PRIMARILY LIM porting. But until I get it properly tuned, the Jury is still at lunch break.

Running the BCA mod the other direction will not gain you any midrange power. The only way to do that is a cam. What you're feeling is the DIFFERENCE because you lost on the low end.

The BCA is CLOSED (not bypassed) at WOT. Adjusting the BCA in either direction can only delay or speed up boost response, not total power. It'* WHEN, not how much.
If you have a 95 FPR and a Walbro pump why is your pressure low?

And for the headers? Are our EM that good that Headers aren't worth it
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Old 02-10-2006, 07:58 PM   #29
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Quote:
Originally Posted by OLDsman105
Quote:
Originally Posted by willwren
Custom headers aren't going to flow much (if any) better than the stock 93-95 ported EM'*. Remember that all 6 cylinders aren't flowing exhaust simultaneously. Sounds like a great expense and trouble for 2-5 horsepower tops?

And when the LIM is FAR more of a restriction to performance?

For those of you who have seen my vid.........I finally checked my fuel pressure today. With a brand new 95 FPR and walbro pump. My pressure is so low it'* LAUGHABLE, but the car still pulls like a raped ape. Why?

EM porting and PRIMARILY LIM porting. But until I get it properly tuned, the Jury is still at lunch break.

Running the BCA mod the other direction will not gain you any midrange power. The only way to do that is a cam. What you're feeling is the DIFFERENCE because you lost on the low end.

The BCA is CLOSED (not bypassed) at WOT. Adjusting the BCA in either direction can only delay or speed up boost response, not total power. It'* WHEN, not how much.
If you have a 95 FPR and a Walbro pump why is your pressure low? As for the BCA I wasn't at WOT but that probably isn't relevant anyway.

And for the headers? Are our EM that good that Headers aren't worth it.
The 92-95 L67 and 92-94 L27 exhaust manifolds are the best manifolds GM has produced to date. And they can be improved. They flow better than cast manifolds.

The 94/95 L67 FPR is rated at 2.7 bar, while the 92/93 is 3 bar. That'* why the lower fuel pressure. It was something I had to try, but it won't be in there much longer.

Nobody can answer the question as to why the pressure rating dropped in 1994, other than perhaps the ON pulse of the injector duty cycle is managed differently by the 94/95 PCMs.
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Old 02-10-2006, 08:02 PM   #30
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Quote:
Custom headers aren't going to flow much (if any) better than the stock 93-95 ported EM'*. Remember that all 6 cylinders aren't flowing exhaust simultaneously. Sounds like a great expense and trouble for 2-5 horsepower tops?
You say that they are not worth it because all 6 cylinders are not flowing exhaust simultaneously. But that is with all engines. The series 2 L67 benefit from headers, anything that would reduce restriction to flow would be a plus. More importantly it would against KR, I do agree with Willwren that porting our Exhaust manifolds would yield a better bang for buck than headers. (sorry in advance if I misunderstood and you have to correct me again) :P
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