Thread: Pro's and Con's of Turboing A N/A 4BD1

Originally Posted by lokka

So dose this mean i can alter the pump a little to gain some more horses providing i use a EGT gauge and try keep my EGT's down ..

I also want to run as big a cooler as i can even if i have to make my own i dont care as long as it dose its job im happy

If your going to add and EGT gauge you can mess with the pump all you like so long as you dont push too much past 600deg c for the EGT before the turbo

But I would advise initially just to give you a baseline on how well the turbo is going to work for you just giving it a touch on the timing (like the timing on a dizzy) and get it sweet without the intercooler and limit your boost to say 6-7psi via the wastegate settings.

Then youve got the turbo you want on the exhaust manifold and youve got an idea about how you want to make it best work with your driving style and can put some time into rethinking your cooling system, induction system and intercooler setup once youve got that sweet you can then think about giving the wastegate and FIP a proper touch up.

Theres a lot of variables that you can fiddle with endlessly and while It may take a while to do it this way your only really adressing one variable at a time and IMHO it stops little problems at one point snowballing into the next and giving you headaches. The other benifit of it is you get to do it piecemeal so if something else goes west your not left with a big problem to get it back on the road should something else tax the finance.

Originally Posted by justinc

Far out, When I was running 650 I ruined 3 ZF autos and had traction issues in the wet...I had to wind it back to stop breaking things. I just towed a van west and back, hottest EGT's into a headwind on a 35deg day was 470 and thatr was for about 3 hours straight at 90kmh. Returned lousy fuel economy that time, down from the usual 22 to 23 mpg to 19.5. I hate wind.

I agree, driving to the EGT gauge is very important when working hard, towing into strong winds in high-ish ambient temps will push them up high as quick as.

For the record, at 480,000km this engine used 1 litre of oil for the 9000km trip.

JC

Obviously didn't get a chance to drop in and pic this gearbag up

Originally Posted by Blknight.aus

If your going to add and EGT gauge you can mess with the pump all you like so long as you dont push too much past 600deg c for the EGT before the turbo

600 pre turbo is a fairly big safety margin. Not that that's a bad thing.
My 4BD1T would only do 550 deg preturbo at around 2500rpm with 15psi (intake temps 130-150 deg C). But at 3500rpm the EGT's would climb to 700, I couldn't get a stable intake temp reading in those conditions.

This on a 4BD1T with a 1/4 turn on the fuel screw which at the time had suspect rings. Haven't tried it lately.

mate the safety margin is there for if you turbo a 4bdI without upgrading the guts... I picked it as thats the hottest Ive ever managed to get a 4bdI and even then IT was borderline outright abuse/NFW type treatment.

I can't wait to do this.

I hope Dave your still up Qld in 6mths or so. Is it true the gunbuggys have a 4bd1T?

Unfortunately I can't see me having the bits before cooma next year. If I get to go it would be good to do the trip in a turbo motor.