blown formula

Ok Procharger & Whipple guys.... question??

What is your EGT at 3000 rpm cruise & at WOT?

I am hitting right at 1400 degrees at WOT on one engine & 1300-1350 on the other. Seems awfully "warm" to me!! What are you reading???

Kanookstr

With my Procharger, I am about 200° - 300°cooler than I was stock!!!! I wanted some stock numbers for comparing, so I mounted my dual EGT gauge to my bone stock 1999 502 mag MPI. I was shock to see that at WOT was getting a reading of 1550° - 1600° Stock!!!!! after putting on the Procharger I was reading around 1250° at 3500, and just under 1350° at WOT... I then increased the fuel pressure to 40PSI at an idle(it was at 36 psi before) now my temps at WOT droped to just under 1300°... The whole time the EGT probe stayed in the same location..

Now when I bought my 2002 Sunsation, it also had a 502 Mag MPI. I had such good luck with the 1999 engine that I desided to swap engines instead of buying a new procharger and doing the work to this engine. And besides, selling an old boat with a brand new engine is easier.... But I didn't swap any gauges because they didn't match the new boat. To make a long story short. I put the probes in the new engine so that the gauge on the dash would work with the new engine.... well sure enough, the new engine had 1550°+++ EGT's at WOT!!!!! Stock!!!

I have over 260 procharged hrs with EGT's around 1300°

blown formula

I thought that "melt down time" was at 1450*.... so that is not true????? I should not worry about this??? It is two brand new engines, so I want to be sure.......

Kanookstr

NO!! Melt down is at 1450°..... I was just explaining that I was reading those temps on the 2 different 502's I had. It was just weird because they were 100% stock????

I would go out and take down numbers at a certain rpm. then stop and increase the fuel pressure by 2-3 psi. then go back to the same rpm, and see what the temps are. I did that about 4 times, till it didn't make a difference. Then I went back down a pound or two, and did a WOT plug reading. You are intercooled right????. In this boat I had to go up a few more psi from the 40 psi I was using in the Stingray. I blamed that on the extra load the Sunsation had compared to the Stingray. I am at 43 PSI at an idle.

blown formula

I am at 46# pressure at idle, intercooled yes, engine temp 105-115*and 3# boost at WOT. Az Speed reworked the ecu's again to add more fuel between 2600-3500 rpm..... it helped but still way up there....

Kanookstr

HUM???? Mine is reworked by AZSM as well B.Formula. I went with there 50 lbs injectors, 2 bar map, reprogram ECU. I am at around 43 psi. Are you running the stock 36lbs injectors??? because I know with 3 lbs + boost, those injectors are running at 95%, which is alot for an injector. Thats why I went with AZSM recomendations of 50 lb injectors. I run at 6 lbs of boost...

blown formula

I would like to do the Mefi 3, 3 bar map sensor & injectors but building this "hot rod" Sonic 31SS, leaves resources a little tight for an over $2000.00 upgrade just for the MEFI 3 & Map Sensors for twins..... with the injectors on top of that!! I just have to be cautious and not bend the throttle too much or especially for too long.!!

Kanookstr

I hear you B. Formula. Two motors twice the price..... I would try more fuel pressure and see what that does to the egt temps.
Good luck my friend
Claude

Mr Gadgets

Another thing to consider is placement of the EGT. From setup to setup you can get varied temps and still be ok. Distance from the exhaust valve is critical. On a before and after test it would be relative, but on setup to setup, becareful to compare apples to apples..

Good luck guys..

blown formula

Mr Gadgets:
Both sensors are mounted in the same location on both engines. Depth or distance from the valve can or will vary slightly & so will sensor to sensor..... but if you are running within 100* of destruction, your careful!!