My transmission build with Alto clutch packs
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I had the FI exhaust and liked it - too loud still and had that slight drone at low rpms though. Now I have the evoTT+cats and it is still too loud for me but not bad either.
The GTM TC is from Edge. The new one I had redone is also from Edge. Andre is knowledgable but there is a balance between heat, efficiency, stall, and WOT performance. My 1st TC was supposed to have a 3200 rpm stall. The problem with such a number is that it does not specify at what input torque level. At stock 230 tq it might be 3200, but at 450 tq it was near 4600!
I'll let you know how this 2nd one turns out. I'll be pissed if it's not what I wanted because I sent Andre dyno sheets and all and told him I wanted it efficient, low heat, LOWER stall than before for the power I was putting down. He promised it would be a 3000 rpm stall at my current power levels. We'll see. It's tough because the stall is right around where the turbos spool. A little too high stall and the turbos will reach max boost and it'll actually stall much higher than expected and be inefficient, generating heat. A little too little stall (before turbo spools), and it will bog big time trying to transfer power without boost. I am skeptical it's dialed in. Not an easy problem though. At least with the 530bb's you can assume you are at full boost and derive tq #s and calculate the correct stall. With the 700bb's it's a little tricky since its in transition at that point (3000 rpms).
FWIW, Andre said the stock TC is really 2100-2200 stall (not 2600-2900 per factory specs) without cavitation. Not sure what he meant by that...
The GTM TC is from Edge. The new one I had redone is also from Edge. Andre is knowledgable but there is a balance between heat, efficiency, stall, and WOT performance. My 1st TC was supposed to have a 3200 rpm stall. The problem with such a number is that it does not specify at what input torque level. At stock 230 tq it might be 3200, but at 450 tq it was near 4600!
I'll let you know how this 2nd one turns out. I'll be pissed if it's not what I wanted because I sent Andre dyno sheets and all and told him I wanted it efficient, low heat, LOWER stall than before for the power I was putting down. He promised it would be a 3000 rpm stall at my current power levels. We'll see. It's tough because the stall is right around where the turbos spool. A little too high stall and the turbos will reach max boost and it'll actually stall much higher than expected and be inefficient, generating heat. A little too little stall (before turbo spools), and it will bog big time trying to transfer power without boost. I am skeptical it's dialed in. Not an easy problem though. At least with the 530bb's you can assume you are at full boost and derive tq #s and calculate the correct stall. With the 700bb's it's a little tricky since its in transition at that point (3000 rpms).
FWIW, Andre said the stock TC is really 2100-2200 stall (not 2600-2900 per factory specs) without cavitation. Not sure what he meant by that...
Last edited by rcdash; 01-07-2009 at 01:50 PM.
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#65
The TQ converter isn't bad, it's just when I stop accelerating the car kinda bogs down for a second. What stall did you get?
rcdash - Thanks man. What didn't you like about the high stall? I'm not going through taking the trans out again, so if I ever did that it wouldn't be for a long time.
rcdash - Thanks man. What didn't you like about the high stall? I'm not going through taking the trans out again, so if I ever did that it wouldn't be for a long time.
Here's a shot:
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bogs letting off? Those usually don't go together since the car is supposed to slow when you let off! lol. I can tell you when my 5th gear engages during cruise, it slows the car more so than any other gear change. Palpable, lazy tc lock up. Hoping that goes away with the new one.
urban - checked out your dyno graph - something is happening up top in rpms. I see you've got some head breathing mods coming along and cams soon which will help for sure. Do you have a crawford plenum? I saw "crawford plenum spacer" - didn't know they made them. Spark blow out or uneven airflow? (sorry for o/t)
urban - checked out your dyno graph - something is happening up top in rpms. I see you've got some head breathing mods coming along and cams soon which will help for sure. Do you have a crawford plenum? I saw "crawford plenum spacer" - didn't know they made them. Spark blow out or uneven airflow? (sorry for o/t)
Last edited by rcdash; 01-07-2009 at 06:50 PM.
#71
bogs letting off? Those usually don't go together since the car is supposed to slow when you let off! lol. I can tell you when my 5th gear engages during cruise, it slows the car more so than any other gear change. Palpable, lazy tc lock up. Hoping that goes away with the new one.
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Sounds like the converter locking up. Mark explained that OEM only locks ~90% and upgraded units can full lock so it can be felt more. I've been looking at alot of OEM transmission tuning and it seems most of them lock only after 4th or 5th gear for gas mileage. Makes for smoothness in a stock car but reduces power transfer in lower gears. Hopefully Uprev will be able to look into tuning the trans module sometime in the future. This could also be the reason the stalls are so outta wack??? (I'm a totaly noob regarding auto trans so take this all with a grain of salt )
#74
How are you monitoring boost? You'll get spikes on an auto alot of times because of the converter "overloading" the motor as it spins up. The EBC might not fix it. Are you able to log boost across the RPM range? Does it drop back to the requested setting after the initial spike?
#75
How are you monitoring boost? You'll get spikes on an auto alot of times because of the converter "overloading" the motor as it spins up. The EBC might not fix it. Are you able to log boost across the RPM range? Does it drop back to the requested setting after the initial spike?
No, I'm not able to log boost. I actually have no idea how to log boost, what is required? I have the SS box the JWT kit comes with. The Greddy EBC I have now records last boost as well as the highest boost recorded. I don't know how to log it across the RPM range, but that would help if I could figure out how to do that.