Finishing up: Engine Intake
05-26-2008, 08:44 PM
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Finishing up: Engine Intake My T/A has some decent work done to it already, including heads, cam, headers, flywheel, clutch, hf oil pump, elec water pump. One thing I did not replace was my stock LS6 intake manifold. I did get a ported and polished stock TB, but that's it.
Now I'm thinking about finishing my car up so I get as much as I can out of my engine and the mods I've already put into it. My LS1 is stock displacement, and I'm thinking about getting the following:
Fast LSX Intake 90mm
Edelbrock or Nick Williams 90mm TB
SLP 85mm MAF
90mm intake lid
I already have a new 90mm rubber joint for connecting the lid to the TB.
With the mods my car has now, it dynoed around 370 RWHP and 360 RWTQ. I'm hoping that those intake replacements will get me right around 400.
I heard that the larger than stock MAFs cause tuning issues. Is there any MAF that is larger than stock that would provide a stable basis for tuning? Any other advice or suggestions for me?
Now I'm thinking about finishing my car up so I get as much as I can out of my engine and the mods I've already put into it. My LS1 is stock displacement, and I'm thinking about getting the following:
Fast LSX Intake 90mm
Edelbrock or Nick Williams 90mm TB
SLP 85mm MAF
90mm intake lid
I already have a new 90mm rubber joint for connecting the lid to the TB.
With the mods my car has now, it dynoed around 370 RWHP and 360 RWTQ. I'm hoping that those intake replacements will get me right around 400.
I heard that the larger than stock MAFs cause tuning issues. Is there any MAF that is larger than stock that would provide a stable basis for tuning? Any other advice or suggestions for me?
05-27-2008, 01:04 AM
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I would like to get the most I can out of the engine without stroking it or doing anything drastic...so would an intake and TB net me the extra 30 RWHP or so without having to remove cats?
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05-27-2008, 03:05 PM
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Dont blow your money on garbage 85mm maf. I put down 462 with a ms3 5.3l heads, and 90/90 with a stock maf.
If the gain from running cats is so small, i.e. 5 RWHP, then it hardly seems logical to remove them completely and have a car that smells like a 70s beater. I think the cats' effect on performance scales up more depending on how much you mod your engine...in my case, I'd say I'm giving up at least 15 RWHP to the cats.
05-27-2008, 03:13 PM
#13
Read the previous posts where I already explained that. Cats + 12-bolt. I also did not have it tuned at the same place so there could be variations between the dynos. The most recent place I had it tuned was Cartek, and I'm pretty sure they got the most out of it that was possible. The only way to get a true before and after comparison is to use the same dyno under the same environmental conditions.
I'd love anything over 450...I have TSP 5.3L ported heads. I don't get why we need to get a 90mm TB and Intake manifold if the maf remains at its stock diameter...wouldn't you make more than 462 if you had a bigger maf?
If the gain from running cats is so small, i.e. 5 RWHP, then it hardly seems logical to remove them completely and have a car that smells like a 70s beater. I think the cats' effect on performance scales up more depending on how much you mod your engine...in my case, I'd say I'm giving up at least 15 RWHP to the cats.
I'd love anything over 450...I have TSP 5.3L ported heads. I don't get why we need to get a 90mm TB and Intake manifold if the maf remains at its stock diameter...wouldn't you make more than 462 if you had a bigger maf?
If the gain from running cats is so small, i.e. 5 RWHP, then it hardly seems logical to remove them completely and have a car that smells like a 70s beater. I think the cats' effect on performance scales up more depending on how much you mod your engine...in my case, I'd say I'm giving up at least 15 RWHP to the cats.
And yes the loss of hp with high-flow cats is very minimal and I too don't see the reason why people don't keep their cars equipped with them...they reduce rasp and exhaust smell. I think people like to ditch them to get a few more decibels out of their car.
05-27-2008, 03:37 PM
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I would be depressed if a setup like that only made 370rwhp on my personal vehicle. Something is off somewhere because this setup or close too has repeatedly produced numbers over 400rwhp with the same drive train as yours. If you are happy with the car and really think you are down 30+rwhp because of cats over similar setups than so be it.
05-28-2008, 12:20 AM
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When I got all the parts I was also expecting to be close to or over 400 RWHP and was disappointed when I found out I was only hitting 370. I am well aware of the fact that many other people seem to be putting down better numbers with a setup like mine.
So what can I pick up that extra 30 RWHP I'm missing. Is there something I am overlooking in my setup? My engine tune is off? If the cats are only sapping me for 5 RWHP I should have around 395 RWHP with my current setup.
So what can I pick up that extra 30 RWHP I'm missing. Is there something I am overlooking in my setup? My engine tune is off? If the cats are only sapping me for 5 RWHP I should have around 395 RWHP with my current setup.
05-28-2008, 05:57 AM
#18
When I got all the parts I was also expecting to be close to or over 400 RWHP and was disappointed when I found out I was only hitting 370. I am well aware of the fact that many other people seem to be putting down better numbers with a setup like mine.
So what can I pick up that extra 30 RWHP I'm missing. Is there something I am overlooking in my setup? My engine tune is off?
So what can I pick up that extra 30 RWHP I'm missing. Is there something I am overlooking in my setup? My engine tune is off?
Also, can you list all your mods - that should help us, help u.
05-28-2008, 07:22 AM
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my buddies 224/228 .580lift cam with stock head, stock rear, and lt's made 395.....you got something wrong somewheres. ever take your car to the track?