Just wait till you see what we are brewing

 

Always do.

 

Thanks guys for the continued thoughts on FI. I do get the concept of more air equals more fuel but I can't understand how people on this board are claiming gains with turbo systems. If you look at several truck guys on here with sts they are saying that their mileage has increased. Even several supercharger company's are claiming an increase in mileage. I don't know all the technical aspects of how that happens but more then a handful of people are making this claim. Just interested to hear what you guys think?

 

Only thing I could think is that it might provide a slight increase of off idle power and make it more efficent (ie lean the car out a bit on a base tune). Other than that, as long as you're out of boost on the highway, you shouldn't see a degration of fuel ecconomy.

 

Still think it's a long shot.... like it was said, you would have to run it lean.... which is dangerous. I think the gains in fuel economy would be negligable. The setup would also be potentially dangerous when you start to tow, as you'd be lean to begin with. (Lean fuel/air mixtures burn hotter and are more prone to detonation, which will ruin your engine over any short length of time, if not immidiately.)

I'd like to see the test data, and then have the logic behind the data explained.

Do you have a particular setup you have in mind?

 

with boost you are able to tow in a higher gear or hold overdrive longer. less rpms and less airflow vs downshifting. this might acount for a slight increase.

 

My trucks fuel consumption is up since I put the turbo on. But its so much fun I don't care!!!


Kurt

 

I could see that, however the turbo/supercharger is increasing the amount of airflow at low RPM's when boosting. It is an air pump... that's what it does!

 

Kurt I'm with you....who gives a crap about gas mileage. If I did I'd drive a honda...lol

 

Perhaps someone can chime in.......Didn't Toyota offer a turbo for it's small pickup in the mid to late 80's? I think (???) they did NOT reccommend towing with it. If that's the case, it seems odd that Toyota wouldn't have configured it to tow.

Back to the thread; you can't simply throw a turbo on a tow vehicle without consideration for managing the increased temps (HP=heat). Long load durations would certainly create lots of heat, so you'd need appropriate water cooling capacity, intake charge cooling management, under hood heat management, oiling, and so on. Add to that, the probable need to upgrade the engine internals to accommodate that prolonged load duration. Basically, engineering a package to meet those demands. If you keep the boost levels low, then you'll have resultant lesser demands. 4-5 psi can still produce a nice increase (thinking towing). FWIW.

Andy1

 

GM Recommended towing 500 lbs. or less with the Syclone and said you shouldn't tow anything with the Typhoon.

Rigging the wastegate to stay open all the time may help. Livernois didn't say you couldn't tow, they just said they would recommend not towing, probably for reasons like Kurt "427" mentioned a few pages back.

-Rick

 

This all makes sense to me and I guess it would work out ok. So if my finial answer was to set it up for 5lbs. boost and a safe tune do you think that would hold up alright? Would it run cool enough for pulling 6,000lbs long distances? Thanks for your replys.

 

it seems there are diferent opinions. i wouldn't do it unless you are willing to work thru some issues. stick a radix on there and be done with it, 100+rwhp and tow ready.

 

Anyone have any more specific info on the motor setup? I've been having strange vissions of doing this in a nondomestic down the road

 

it does improve gas mielage on daily drivers and they don't have to have it to the floor to get the turbo to spool up. i had a freind with a turbo on his accord and going down the interstate he could hit just a slight incline and you could hear the turbo spool ever so slightly. but it increases mileage basically becouse under normal driving it is easier for the eng to pull the vehicle. it don't take as much go peddle to get it moving and to keep a steady speed. yeah it will suck more if your getting on it but just driving around and towing it will give better mileage becouse it don't take as much to do the job. there are tons of people on performancetrucks.net that have seen better mileage i think about everyone that has one has seen it from what i've seen. matter of fact here are a few of the guys. click here there are always gas going through the turbine housing on the turbo its not like they just appear there once you hammer the throttle down. anytime that turbo get a load on it, it starts to spool and give power to help pull the vehicle. don't mean to rant just agrivated its been proven by many people. and as far as towing read the second post.