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Post by filasfinest86 on Sept 22, 2009 20:44:07 GMT -5
Hey guys just wanted to see what timing curve was safe to run on the turbo 2.3 to stay away from detonation.
I have a 86 2.3T I have a Holley 500cfm blowthru carb setup with front mount intercooler im starting off at 8lbs of boost and eventually going as high as 12lbs will my current timing curve be okay for what im going after?? Also i should mention I have the NA head so i should have a little higher compression than you true TURBO guys..also I have a solid lift cam with 455 lift. Also im going with a fairly small turbo in hopes that it will spool fast like in the 2500 range!for max torque! its a .48AR turbonetics I have a MSD PRO BILLET CENTRIFICAL ADVANCE DISTRIBUTOR with a 6AL BOX and my current setting is 7 degrees at Idle and MAXES OUT @ 4000 with a total timing of about 28 degrees
do i need to stop the advance sooner?
Thanks in advance for your help HAHAHA ;D
AGAIN MY COMBO
8 to 12LBS of boost
.48 AR TURBO FULL BOOST AT 2500
HOLLEY 500 CFM BLOWTHRU
N/A HEADS HIGHER COMPRESSION
7 deg inital, 28 DEG TOTAL COMBINED
WALSH CAM 455 lift
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Post by Stinger on Sept 22, 2009 22:30:16 GMT -5
On EFI versions (which is all I mess with), the timing retards at initial boost onset (2500rpm you say) to around 14-16 degrees, then slowly ramps back up until it reaches the max timing around 6k. At 12psi you can probably get away with 26-28 degrees with a turbo head on pump gas. I don't think there is any way that would be safe at 4000 rpm though.
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Post by filasfinest86 on Sept 22, 2009 22:52:12 GMT -5
What do you mean by retards at inital boost onset??? sorry im a nube. does that mean i have to get one of those cam sprockets to retard it?? where should the advance curve stop safely then around when full boost kicks in??? 3000...? I always run 93 octane in it
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Post by filasfinest86 on Sept 22, 2009 22:58:54 GMT -5
On EFI versions (which is all I mess with), the timing retards at initial boost onset (2500rpm you say) to around 14-16 degrees, then slowly ramps back up until it reaches the max timing around 6k. At 12psi you can probably get away with 26-28 degrees with a turbo head on pump gas. I don't think there is any way that would be safe at 4000 rpm though. would 15-20 degrees total be safe for 5000rpms??thats about what i shift at with my solid lift cam  SO the turbo efi advance curves dont look any thing like a straight hill with a plataeu at about 3000 or 4000?? the timing acually goes down then increases when boost in introduced?? |
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Post by turbo23240sx on Sept 22, 2009 23:59:55 GMT -5
I have a similar setup with the 500 holley, holset turbo, powerstroke intercooler and run the stock TFI distributor locked at 20* and 25psi. I run zero advance and some bitch about fuel economy yet i have found almost no measureable difference. I think you can lock your dizzy if you want or run it with advance if you like?
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Post by Stinger on Sept 23, 2009 13:46:26 GMT -5
On EFI versions (which is all I mess with), the timing retards at initial boost onset (2500rpm you say) to around 14-16 degrees, then slowly ramps back up until it reaches the max timing around 6k. At 12psi you can probably get away with 26-28 degrees with a turbo head on pump gas. I don't think there is any way that would be safe at 4000 rpm though. would 15-20 degrees total be safe for 5000rpms??thats about what i shift at with my solid lift cam SO the turbo efi advance curves dont look any thing like a straight hill with a plataeu at about 3000 or 4000?? the timing acually goes down then increases when boost in introduced?? You can probably get away with 22-24 degrees at 5k At wide open throttle with the stock ecu, the timing is high out of boost (below when the boost starts building), then as boost builds the timing is pulled out initially at peak tq to keep it from detonating. The timing linearly climbs from boost onset (the rpm you first see boost) to redline. There is no plateau. |
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Post by filasfinest86 on Sept 23, 2009 17:43:26 GMT -5
I have a similar setup with the 500 holley, holset turbo, powerstroke intercooler and run the stock TFI distributor locked at 20* and 25psi. I run zero advance and some bitch about fuel economy yet i have found almost no measureable difference. I think you can lock your dizzy if you want or run it with advance if you like? So you think to increase botom end tourque i should have it max advance when full boost is acheved?? like 22 Degrees around 2500-3000..when turbo spools.? dont forget i have the high compression N/A head YOU THINK THIS COMBO WILL BE GOOD FOR BOUT 200hp?? |
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Post by Stinger on Sept 25, 2009 10:26:56 GMT -5
He has alky injection which allows that much timing down low. You can't safely get away with it on pump gas.
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