this anyone on here?
Teching In
Joined: Nov 2013
Posts: 3
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I didn't really pick his brain at all on the setup. Other than the custom work to make it fit its not anything weird/crazy so nothing i felt i needed to know. Its an ls motor with a tvs1900 on it...pretty common.
As far as experince I've been building/racing 3800 stuff since '03. Set quite a few different dyno records and a few 1/4 mile records over the years. I worked at ZZP for a couple years building turbo and sc 3800 stuff along with a few ls4 builds, and also ecotec stuff as well as dyno tuning for all of the above. Got pretty familiar with 600+whp fwd stuff.
I daily drove a "fully built" M90 3800 setup for about 5 years that i also sprayed a 125 shot with (made 403whp and went 11.2 @ 124 off spray) Got plenty of experience fixing those garbage transmissions over the years between my car and all the others I've built/fixed.
I've also done a couple LS swaps into older cars along with quite a bit of tuning on LS stuff. I also own a 06 GTO with a M112 on it.
I've browsed here for probably a decade but never had any need to post before now.
I'll keep you guys updated on progress of the car.
That's pending a iat relocation though. Monitoring pre blower only does so much. Curious if the current setup had it relocated. To the manifold
Teching In
Joined: Nov 2013
Posts: 3
Likes: 0
IAT is not relocated, it was reading in the 40s since its just an open filter. But yea timing will drop fast when it warms up a little. 17 degrees doesn't really bother me other than knowing the stock downpipe is smaller than 2" in some spots. Haven't thrown the wideband on it yet so who knows what the fuel looks like.
Relocating to the manifold is only going to cause fueling issues between winter and summer months. I've been through this before with plenty of blower setups. The IAT and tune are not designed for monitoring blower temps, they are designed to adjust fueling from IAT based on whats coming into the intake. You can easily tune out any ignition related issues based on this as post blower temps are more consistent vs seasonal air temps. An intercooled blower can range from 125-150* IAT post blower, which is a marginal change in timing. Where as the swing from using the IAT in a place it doesnt belong can swing AFR's from 12:1 in the winter to 10:1 in the summer.
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Verdad Gallardo THat is not what I am referring to, as far as our engines our concerned, our tunes are designed specifically to read IAT's in the intake track itself. Not post supercharger. Not to mention the fact that measuring post supercharger is the incorrect way to measure IAT's. Take note of the fact that ALL 3800 SC cars use the IAT in the intake just in the same manner that NA cars do. It is vital for a modern car to know what the temperature of the air is coming into the engine BEFORE it is heated by the supercharger, as calculations of air density based on this are vital to fueling. If you have the IAT after the blower, the IAT reads consistently hot, which gives it less of a range of auto adjustment for fuel when the temperature changes from 20* to 90* outside. The car might run smoothly in one temperature, but as the season changes, you will have to retune.
Even throwing out a 3800sc calibration point is irrelevant. Archaic at best. WE are talking about ls9 specific stuff which in this case the op is using. The ls9 does in fact use 2 iats pre and post and a bbv.
Ill repeat it again, for OUR tunes, meaning our E67 ecu that comes with our cars, NOT an LS9 ecu. They are designed to read the IAT from the intake track. Unless you change to a stand alone system or an ECU/tune setup that is programmed to account for post blower IAT's, it is incorrect to put the IAT sensor after the supercharger. This has nothing to do with ports on the intake manifold, this has to do strictly with the engine tuning.
Originally Posted by spawne32
Ill repeat it again, for OUR tunes, meaning our E67 ecu that comes with our cars, NOT an LS9 ecu. They are designed to read the IAT from the intake track. Unless you change to a stand alone system or an ECU/tune setup that is programmed to account for post blower IAT's, it is incorrect to put the IAT sensor after the supercharger. This has nothing to do with ports on the intake manifold, this has to do strictly with the engine tuning.
You could use it for the torque management and secondary IAT controls, but you cannot use it as a replacement for the IAT in the intake, as once again the issue comes into play where you confuse the fuel tables on the car. Wiring the secondary IAT for safety reasons, assuming the ECU will take the pinouts properly, then it becomes as simple as enabling it on the torque management tab for SC. BUT you cannot write an LS9 tune on the car and expect it to work either. GM came up with some unique stuff in the E67 for supercharger controls but it still comes down to the fact that the IAT sensor used for fuel control has to remain in the intake preblower. GM has recognized this from the earliest of 3800 SC cars which you could use as the basis for tuning here, as we share parts like the MAF with the 3800 of our model generation.
You realize how many 3800 sc motors blew up with chipped pistons? Accounting for air temp on both sides is key to longevity point blank. Hp tuners/efi live already has the option to turn on alot of supercharged related stuff.you don't need the os, but you can't use the tables and modify accordingly
You realize how many 3800 sc motors blew up with chipped pistons? Accounting for air temp on both sides is key to longevity point blank. Hp tuners/efi live already has the option to turn on alot of supercharged related stuff.you don't need the os, but you can't use the tables and modify accordingly
