dyno on 42's
10-17-2007, 06:33 PM
#26
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exactly! just because i am not running a small enough pulley to need the full effect of 60s that doesnt mean it still isnt better to have 60s for tuning reasons. i dont know anything about it myself really but the guy that tunes my car told me to get the 60s even if i didnt plan on modding anymore then i am now. i am interested in water/meth injection but i cant get him to warm to the subject, he calls them a bandaid for a bad tune
10-17-2007, 06:35 PM
#27
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269/252 in sae.
it was 62 degree's on the dyno that night.
anom. the mixture coems out to be around 103-105 octane. i don't mix it exactly to the oz, so it's just a guess.
10-17-2007, 06:38 PM
#29
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the only reason why i run it that high is when im on the dyno, or in a close race with someone. normally, i shift right at 7.
who told you it makes power at redline?
exactly! just because i am not running a small enough pulley to need the full effect of 60s that doesnt mean it still isnt better to have 60s for tuning reasons. i dont know anything about it myself really but the guy that tunes my car told me to get the 60s even if i didnt plan on modding anymore then i am now. i am interested in water/meth injection but i cant get him to warm to the subject, he calls them a bandaid for a bad tune
so i guess a 40 degree drop in temps after the blower is part of a bad tune bandaid idea.
::shrugs::
Last edited by Area47; 10-17-2007 at 06:38 PM. Reason: Automerged Doublepost
10-17-2007, 06:40 PM
#30
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got me man, i know he is a very good tuner but i think he hasnt really looked into it so he doesnt want to mess with it.
10-17-2007, 07:01 PM
#32
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even the best tuner cant cool down super hot iat2s alone
this is where the water injection or watermeth come into play.
they also come with added benefits, other than just cooling.
nice numbers area.
this is where the water injection or watermeth come into play.
they also come with added benefits, other than just cooling.
nice numbers area.
10-17-2007, 07:06 PM
#33
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I recall a guy talking about his dyno numbers about a week ago saying he made like 255hp at 7300rpms with stock cam. And I told him that the dyno had to be calculating RPMs improperly because there is no way. Even with nitrous you cannot exceed the powerband of your cam. It controls too much. And our cams pull till 6700, science!
Last edited by Psykostevo; 10-17-2007 at 07:06 PM. Reason: Automerged Doublepost
10-17-2007, 07:07 PM
#34
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nothing spectacular here guys,
nice tuning area, whats the EGT's @ (sorry if i missed it)
As i read the 1st post im like he has to be on water inj or this isnt possible, then i read down a few posts, yup.
sounds like a nice setup you got
nice tuning area, whats the EGT's @ (sorry if i missed it)
As i read the 1st post im like he has to be on water inj or this isnt possible, then i read down a few posts, yup.
sounds like a nice setup you got
10-17-2007, 07:08 PM
#35
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exactly! just because i am not running a small enough pulley to need the full effect of 60s that doesnt mean it still isnt better to have 60s for tuning reasons. i dont know anything about it myself really but the guy that tunes my car told me to get the 60s even if i didnt plan on modding anymore then i am now. i am interested in water/meth injection but i cant get him to warm to the subject, he calls them a bandaid for a bad tune
10-17-2007, 07:15 PM
#36
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METH can be used to cool the air regardless of whether you are tuned for it or not, allowing you to pull longer than normal. But tuning for it requires experience, and YOU as the driver to be more than intelligent. There is no way of knowing you are out of METH either, since there is no warning light. Another scary thought.
10-17-2007, 08:03 PM
#38
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METH can be used to cool the air regardless of whether you are tuned for it or not, allowing you to pull longer than normal. But tuning for it requires experience, and YOU as the driver to be more than intelligent. There is no way of knowing you are out of METH either, since there is no warning light. Another scary thought.
10-17-2007, 08:04 PM
#39
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10-17-2007, 10:22 PM
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I don't know man, 12.3 afr is pretty scary. I blew mine up at 11.7-11.8 with no knock at all. Your sitting on the razors edge at 12.3 IMO. Incredible numbers for a 2.8" though 
10-17-2007, 10:38 PM
#44
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I still have a doubt that people blow their LSJ caused by the 11.xxishh AFR only. I suspect those tiny exhaust ports, can you say high heat. I still remind the GMPP 300+HP build book that states the ported head is necessary to get the heat away, and also I still remind having read somewhere the stock head is efficient up to only 275 HP.
10-17-2007, 10:41 PM
#46
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10-18-2007, 12:11 AM
#48
Ok I might have to throw out a BS here. Here is a conversation I had with Area47 on 10/11 on RLF. He seemed pretty adamant about not putting 42’s in his car.
No wonder he won’t offer anyone the tune….
We were talking about the tb out of Trailblazer, Envoy, etc.
No wonder he won’t offer anyone the tune….
We were talking about the tb out of Trailblazer, Envoy, etc.
Originally Posted by Area47
well, i can safely say this is a hell of a mod. aggressive timing maps need not apply. it is very very very touchy on throttle inputs. went from 252, to 268 on the air flow numbers {map g/sec} so yes there is more air moving in, so one must account for this. i went from commanding 12.20 to 11.3 to maintain the same afr. timing needs to be dropped down quite a bit to account for this as well.
it is not a slap on an go kind of mod. you will have to do some tweeking here and there with it. be prepared for it.
this is with the ls4 tb.
BTW, there are tb spacers on the market you can buy for these. i'll post a list later for them.
it is not a slap on an go kind of mod. you will have to do some tweeking here and there with it. be prepared for it.
this is with the ls4 tb.
BTW, there are tb spacers on the market you can buy for these. i'll post a list later for them.
Originally Posted by ebristol
The a/f numbers you are citing are those of a custom tune correct? This maybe too much to ask but I was wondering if you could load up a GM Stage 2 tune and see how the bigger tb effects your a/f ratio.
I know Rebel is talking about putting out some dyno numbers on this upgrade on a stage 2 cobalt. I applaud them for their efforts in bringing aftermarket products to the LSJ but if I held my breath every time they said they were going to do something I wouldn't be here right now!
I know Rebel is talking about putting out some dyno numbers on this upgrade on a stage 2 cobalt. I applaud them for their efforts in bringing aftermarket products to the LSJ but if I held my breath every time they said they were going to do something I wouldn't be here right now!
Originally Posted by Area47
im not swapping the 42's back in. sorry man. if my afr gets affected, it's going to affect all cars. thats a given. yes my tune is way beyond stock
10-18-2007, 01:19 AM
#50
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as long as you don't beat on the car to bad you don't have to worry about the afr to much i ran 12.5 for the longest time on my 2.5 pullied setup without one hicup. The reason why your car blew was becuase of the heat from all the back to back to back runs and how you drove your car