dyno tommorrow
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From: anchorage ak
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
Seems like the afr was a little low I found the best power with like 12.6, did you get to make changes and make more passes? When I did the l48 with a new cam heads and intake we were able to pick up 14 or so horse just with jet changes. With the stock cam and stock untouched import heads I'd say you did alright.
Le Mans Master
Joined: Oct 2010
Posts: 6,937
Likes: 848
From: melbourne florida
2023 C3 of the Year Finalist - Modified
I think those figures could have been better with some tuning, the factory intake is garbage. But at least you have an idea of where you are.
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Thread Starter
Racer
Joined: Jan 2013
Posts: 300
Likes: 10
Seems like the afr was a little low I found the best power with like 12.6, did you get to make changes and make more passes? When I did the l48 with a new cam heads and intake we were able to pick up 14 or so horse just with jet changes. With the stock cam and stock untouched import heads I'd say you did alright.
Thread Starter
Racer
Joined: Jan 2013
Posts: 300
Likes: 10
Why do you say the stock intake is garbage? I have several comments that say its fine so I don't know which way to go. I have a edelbrock performer on the shelf is that a step up? Why?
Le Mans Master
Joined: Oct 2010
Posts: 6,937
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From: melbourne florida
2023 C3 of the Year Finalist - Modified
The plenum has no volume the turn to the runners is too sharp. All it takes is looking at one to see it. It's like everything else you make a change you need to adjust timing and fuel. The performer is a better intake and others are better than that.
There's b.s going around that the aluminum L82 intake is based on the LT -1 , the only similarity between the two is the bolt pattern.here's a cold hard fact, since the 1970's the L-82 has an N.H.R.A factored horsepower of 312. I'm sure that includes open exhaust and optimum tuning. What kind of exhaust system do you have? I think you have a good bit of power left on the table.
There's b.s going around that the aluminum L82 intake is based on the LT -1 , the only similarity between the two is the bolt pattern.here's a cold hard fact, since the 1970's the L-82 has an N.H.R.A factored horsepower of 312. I'm sure that includes open exhaust and optimum tuning. What kind of exhaust system do you have? I think you have a good bit of power left on the table.
Le Mans Master
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From: Hermosa
Thread Starter
Racer
Joined: Jan 2013
Posts: 300
Likes: 10
The plenum has no volume the turn to the runners is too sharp. All it takes is looking at one to see it. It's like everything else you make a change you need to adjust timing and fuel. The performer is a better intake and others are better than that.
There's b.s going around that the aluminum L82 intake is based on the LT -1 , the only similarity between the two is the bolt pattern.here's a cold hard fact, since the 1970's the L-82 has an N.H.R.A factored horsepower of 312. I'm sure that includes open exhaust and optimum tuning. What kind of exhaust system do you have? I think you have a good bit of power left on the table.
There's b.s going around that the aluminum L82 intake is based on the LT -1 , the only similarity between the two is the bolt pattern.here's a cold hard fact, since the 1970's the L-82 has an N.H.R.A factored horsepower of 312. I'm sure that includes open exhaust and optimum tuning. What kind of exhaust system do you have? I think you have a good bit of power left on the table.
Safety Car
Joined: Jan 2009
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From: anchorage ak
Le Mans Master
Joined: May 2007
Posts: 5,028
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From: North tonawanda NY
the performer rpm "non air gap" will have slightly better clereance and will also not have the section of the plenum divider cut awy so it should have better torque at lower rpms than the airgap which is more of a compromise for better top end and cooler airflow for the first ten minutes or so when started from cold... After that warmup period the air gap offers no real performance / temp advantage according the the article I read where they tested all of these intakes.
Just to recap as far as edelbrock goes theres the performer eps and performer which are egr and non egr versions of the stock replacement intake I believe with stock height idle-5500rpm, then the more aggressive performer rpm which is more for 1,500-6,000 rpms and the rpm air gap which performs better at like 1,800 to 6,500 rpm ... this could be off but its the gist of what I remember..
a good inexpensive way to see how your engine is going to respond is to try an open 1/2" spacer vs a 4 hole spacer ... that will have more or less the same effect on performance as the open cutout divider on the airgap vs a true dual plane rpm.
Just to recap as far as edelbrock goes theres the performer eps and performer which are egr and non egr versions of the stock replacement intake I believe with stock height idle-5500rpm, then the more aggressive performer rpm which is more for 1,500-6,000 rpms and the rpm air gap which performs better at like 1,800 to 6,500 rpm ... this could be off but its the gist of what I remember..
a good inexpensive way to see how your engine is going to respond is to try an open 1/2" spacer vs a 4 hole spacer ... that will have more or less the same effect on performance as the open cutout divider on the airgap vs a true dual plane rpm.
Last edited by augiedoggy; Jul 29, 2015 at 05:28 PM.