What do the IATs get up to with this set-up above? Are they as bad on the street as on the dyno?

 

I really dont think you are anywhere near the limitations of the MagnaCharger. I have seen the Radix 122HH put down more boost with similar builds and not see high IAT's.

 

Maybe starting with a turbo would've been a good choice before the build, but I sure wouldn't switch at this point. There are plenty of trucks that use Mags with enormous success. Sounds like a great build, just hang in there!

 

I ran his truck at 10psi which made 10-20hp more than the 6-8lbs he has now.Thats all the combo does. Intake temps hit 200-240 degree's running 3 gears.Wit hthe straight meth it is lower.

 

I have never seen temps like that. Did you look for the cause of the temps. There is no way that temps like that are caused by the 122HH. If it was caused by the 122HH then everyone would be seeing those especially at those modest boost levels.

 

Of course we looked into it.Intercooler,pump lines are hooked up right and flowing well.Tune was changed many ways with same result. This isn't the first Maggie vehicle that has run these high temps that has come through the shop.Today I ran a Vette pushing 8lbs that hit 185 degree's on the runs.This Vette was pulleyed alot lower than Dhpro's truck due to 10.2-1 comp.

It's not boost level,it's the speed the blower is spinning that creates heat.Dh's truck has an overdrive crank pulley with either the 2.8",3.0 or 3.2 blower pulley.With the 2.8" the inlet would get stupid high temps.Boost pressure is only a measure of back pressure as I'm sure you know.This is the main reason this truck should be running 10-1 comp or even 10.5-1 comp.so the blower would work less to fill the cylinders.
We had nothing to do with building the motor,as ussual we have the pleasure of tuning it to try to make it work. My suggestion was to go Turbo for the owners power goal and driving habit's.

 

I am turning my 122HH a lot faster with nowhere near those temps. I understand there is a difference between my style and the Radix. We ran mine for 2 days on the dyno at 15 psi and never saw temps over the 160's with no meth. We had to beat it with repeated back to back pulls to get to the 160's. I run mine on the street and see between 108-118 around town and the 130's at the end of a long pull.

I also watched Grip with his and the highest temps we saw at closed throttle blade after a long pull at 10 psi was 150 degree IAT's. I also understand that in repeated pulls on a dyno the temp will climb but not that high without a reason.

I understand that you were not part of the build, but to have temps like that tells me something is not right and a turbo wont fix the problem.

 

Like I told Randy today, there is something in his combo that is causing these issues. There are hundreds of people making the power and not seeing these temps. I figured Slowhawk is trying to talk him into running a turbo, I could tell in Randy's messages that he is discouraged. I figured it would only be a short time before that shop sucked him dry wore him down and tried to talk him into a 8000.00 turbo system.

 

Both systems are proven...Don't go turbo because of IAT's, there's plenty of reasons to go turbo but high IAT's isn't the right reason. There's something not right with the combo, find that problem first then decide on whether to go turbo. However, going turbo is something Slowhawk is really really good at doing!

 

I and a few others have looked thru the whole motor and can't seem to find anything other than the compression that can be causing the IAT issues. I've had the pan off and checked the bottom end, and clearances, had the heads off, milled and pistons looked fine. The exhaust is Dynatech LT's, gutted cats and true 3" duals, so there's no restriction there. Now granted I haven't redyno'd since I solved the hi-oil temp problems, and frankly that cud have contributed to all kinds of heat. Oil temps are down to normal (212-220*) and engine temps are easy 15-20* cooler (180-185*) It certainly drives better now.
I'm certainly open to suggestions! Seems that throwing more cash at this is getting old tho. By the time it gets solved I cud just have someone build me a new motor - heck I can get a crate 427 for $12k and make the same power if not more!