Tuning my DR750s on Chrome

[Chris@Rvengeperformance]

I would be more inclined to think that you introduced Ethanol into a dirty engine and it started cleaning deposits and circulating them. Knowing now that this isn't the first time this is happened with those turbos I suppose excessive torque could be a possibility. I thought DR750s were okay turbos for a stock engine?

Could be, but this engine was really well maintained. I have oil change records back to 1995. I also checked the oil both days before I went out and you could still see through it and it did not smell like fuel.

I really think more people are going to be inclined to say if you are really going to use dr750s for what they are made for you need a built block.

[vroom4]

Isnt there a ray's 3.7 for sale on the other forum?....

[Chris@Rvengeperformance]

Isnt there a ray's 3.7 for sale on the other forum?....

Have a link? I haven't been over there for a long time. Probably out of my budget anyway.

[AdamVR4]

if you use this tool:

Dynomite - a collection of 3S dyno charts

I think I suspect the issue. I'm not picking on him, but since he is stock shortblock the comparison makes sense. Pick adamvr4's torque and the pick ray's dr750 torque. Then look at mine. Around 3500 even if you account for my vd software reading high ray and I are both making 400-450 torque, while the 16G setup is around 300.

I think the E85 and instant spool of those turbos is just too much down low and probably bent a rod.

If anyone wants to run a similar setup I would keep boost low until over 4000 or get a built short block.

hahaha, this thread made me wonder how my loose, tired engine had never spun a bearing. Interesting hypothesis and you see the same trend with Trevor's E16G's. Those DR750's are really producing insane amounts of low end torque (TT Eric's DR750 TQ curve is hilarious). Good luck with the rebuild!

[vroom4]

3000GT/Stealth International Message Center

slightly out of your budget haha.

[Chris@Rvengeperformance]

3000GT/Stealth International Message Center

slightly out of your budget haha.

A little tempting I must admit, but I think more displacement is not going to be needed. Response is already like a big v8.

I'm *hoping* to get it back together for around what that block costs. That includes ray rebuilding the heads, shortblock, gaskets, cleaning up the turbos at DR.

going to be tight

[Chris@Rvengeperformance]

oh and I need an oil pump and timing belt tensioner too, turbo feeds, maybe the returns

[vroom4]

will you just hella-flush the cooler/lines?

[Chris@Rvengeperformance]

will you just hella-flush the cooler/lines?

I'm going to see what Ray thinks and if he can flush them for me. If he says to toss it then I'll do that, but it seems pretty wasteful.

[sergechronos]

I would be more inclined to think that you introduced Ethanol into a dirty engine and it started cleaning deposits and circulating them. Knowing now that this isn't the first time this is happened with those turbos I suppose excessive torque could be a possibility. I thought DR750s were okay turbos for a stock engine?

750s are, to my knowledge, at the edge of what stock internals can take on 93 or similar. E85 is somewhat more unknown for the platform that's only just really started to take off in the last year or two IMO (correct me if I'm wrong), so there's not a lot to draw from. Previously though, pistons were generally the weak point of the stock internals, but E85 burns much cooler than gas. Probably to the point that the pistons are less susceptible to damage. Throw in the way that E85 moves the torque curve, rods probably do become the new weak link with the kind of low RPM load from E85. Of course, this is speculation until he tears into the block and has a definitive answer on what happened.