turbor850 Posted November 19, 2009 Report Share Posted November 19, 2009 Just to throw my 5 cents, I have almost 20k on my build engine with garrett t04e and now t04b vtrim , never had head gasket issues . My car had seen 28 psi up to 7200 rpms. You don't need studs for 25psi . That is number that we can put over 400whp with right tune. Check your head . I hope nothing happen to you like Greek guy , head cyl walls. Let us now how it looks. Speaking of your car, where's that dyno ? and to OP, you hit 7500 with your auto on what tune ? Link to comment Share on other sites More sharing options...
GeraldJ Posted November 19, 2009 Report Share Posted November 19, 2009 When you pull the head off dont be surprised to see a dime sized hole in the number 2 piston. What happened is to much boost to fast and the motor detonated. Link to comment Share on other sites More sharing options...
7 VII 7 Posted November 19, 2009 Report Share Posted November 19, 2009 When you pull the head off dont be surprised to see a dime sized hole in the number 2 piston. What happened is to much boost to fast and the motor detonated. tough crowd Link to comment Share on other sites More sharing options...
esundell90 Posted November 19, 2009 Report Share Posted November 19, 2009 Holy cow! That sounds terrible!! Get any pics of the carnage yet? Link to comment Share on other sites More sharing options...
GeraldJ Posted November 19, 2009 Report Share Posted November 19, 2009 tough crowd Im not trying to be harsh. I am just saying. I know guys running 30+lbs on single and twin turbo cars and trucks and dont run such a hard spring in the gate. My brother in law has a twin turbo small block with each turbo running 25lbs and he only uses a 12lb gate spring in each. Just because you want to run 22lbs does not mean you use a 22lb wastegate. The boost curve will be to sharp and will cause problems. Boost has got to come on progressively or the ecu cannot factor for it. When you brake boosted to 2500 you already had 20lbs built up and then you just let it go on the poor motor just getting up to speed. Kind of like swinging a 12lb sledge hammer at a pinata. If I remember in your build you used OEM pistons and forged rods. The pistons are the weak link. If you used a stock rod you could put a string on it and shoot arrows from it by now. The problem now is you have a peep hole in your piston. Link to comment Share on other sites More sharing options...
TyConn Posted November 19, 2009 Report Share Posted November 19, 2009 those people don't have volvos Link to comment Share on other sites More sharing options...
L8 APEKS Posted November 19, 2009 Report Share Posted November 19, 2009 and to OP, you hit 7500 with your auto on what tune ? ??? Link to comment Share on other sites More sharing options...
GeraldJ Posted November 19, 2009 Report Share Posted November 19, 2009 those people don't have volvos Whats that matter? An internal combustion engine is just that. It doesnt matter who makes it or how many cylinders it has. All the rules are still the same. Link to comment Share on other sites More sharing options...
Jardon Posted November 19, 2009 Report Share Posted November 19, 2009 those people don't have volvos I think his point was that you don't need a 30psi actuator spring to run 30psi boost when you have a BCS. As a rule of thumb a spring rated at half the required boost is adequate and a third might get you there. It's trial and error - my car with a 4-5 psi wastegate will just about hit/hold 18 psi but with an extra turn on the actuator will hit and hold 21 psi. Link to comment Share on other sites More sharing options...
Jardon Posted November 19, 2009 Report Share Posted November 19, 2009 Just to add - a 19t is only above 65% efficient with my boost plot from around 2500 to 6000 rpm. Above 6000 rpm even with only a bar of boost it is off the compressor map (inefficient). The same goes for all TD04 turbos - but less efficient for say a 15g which can only flow less for a given amount of boost. The high rev/high boost will not be nice to drive and will bugger something eventually. Go with lower boost, as many flow mods as you can afford and a good tune. Link to comment Share on other sites More sharing options...
EricF Posted November 19, 2009 Report Share Posted November 19, 2009 Just to add - a 19t is only above 65% efficient with my boost plot from around 2500 to 6000 rpm. Above 6000 rpm even with only a bar of boost it is off the compressor map (inefficient). The same goes for all TD04 turbos - but less efficient for say a 15g which can only flow less for a given amount of boost. The high rev/high boost will not be nice to drive and will bugger something eventually. Go with lower boost, as many flow mods as you can afford and a good tune. I think you may be making some hasty calculations. What are you using as your VE constant? With the TD04HL and especially stock manifold, VE is way down above 4500 or so. It peaks in the 3500-4000 range... Link to comment Share on other sites More sharing options...
ozzimark Posted November 19, 2009 Report Share Posted November 19, 2009 I think you may be making some hasty calculations. What are you using as your VE constant? With the TD04HL and especially stock manifold, VE is way down above 4500 or so. It peaks in the 3500-4000 range... Blasphemy! Everyone knows the stock whiteblocks see a VE of around 1.2 at redline! :lol: Seriously though, the 19T should be doing up to around 1.5 bar before it gets close to the choke limit of the compressor with the engine at redline, if not more. The VE of these engines is so bad that I've noticed airflow actually DROPPING with increased rpm past ~5k or so on the stock setup I think it's time for some velocity stacks and a tubular manifold on my engine :huh: Link to comment Share on other sites More sharing options...
turbor850 Posted November 19, 2009 Report Share Posted November 19, 2009 ??? 22-23 psi steady and spiking to 25-26 no issues. So I decide to do a hard launch and brake torque from 2500. I hit 7500 in first and then have a massive explosion Auto + 7500 + what tune ? Link to comment Share on other sites More sharing options...
PsychoWagon Posted November 20, 2009 Report Share Posted November 20, 2009 I'm running 22psi with turbonetics mbc and a st tune. I'm hitting fuel cut when it spikes though, I was quite frustrated with the fact that I hit fuel cut with a ST tune... unless its my ignitio system DEAD missing... MSD Blaster coil tho... hmmmmmm I'm wondering now, fuel gauge on tomorrow. Link to comment Share on other sites More sharing options...
L8 APEKS Posted November 20, 2009 Report Share Posted November 20, 2009 Man, one of you guys needs to have your laptop hooked up to your OBDII and go flog your car, watching the spark advance on one of the free ODBII scan programs (EasyOBD, OBDIISpy, etc). I'd be very surprised if you're getting full advance at 22+ psi on 91-93 octane. Well, maybe 93...but us CA guys who only have 91 have got to be suffering in the spark advance department! Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.