Bolt on dsm Vid... 455 whp

[nanokpsi]

You have to remeber that Jeff new his car was/is on the edge so he kept his tune conservatice. He ran richer af ratios and kept the timing down to avoid any mishapps.

 

[92awddsm]

A boost leak would have made it go rich. It went lean instead. Im guessing detonation blew the rod apart.

 

[Superbeast406]

A boost leak would have made it go rich. It went lean instead. Im guessing detonation blew the rod apart.

Wrong, detonation has little effect on the steel rod beneath the piston.

You can see how the engine let go. The piston pin left the motor indicating rod falure to the max!! . If it were a lean condition or detionation at that kind of boost a hole the size of a half doller would have melted the top of the a piston or pistons very quickly and the engine would have just droped in power. It had a good tune to make 450 HP at the wheels (I would think). This was on a stock seven bolt with the smaller rods. The weak link in that motor is the rods as is every stock motor. Im surpised that it lasted that long.

Melted pistons, heads and burnt valves are by products of excessivly lean conditions. Usually when a rod rips through the side of a block, its because the motor was overreved, or the rod cap or bearing just gave out. Watching this video makes me wish I had at least upgraded to ARP rod bolts when i put my motor together. Oh well, I'll bet that rod shooting through the side of the block looks even better in person. Nice example of how much the 4g63 can take though, thanks for sharing squeak10686.

 

[stupify]

what shop was the video taken at?

 

[TSIfreek]

Wrong, detonation has little effect on the steel rod beneath the piston.
Melted pistons, heads and burnt valves are by products of excessivly lean conditions. Usually when a rod rips through the side of a block, its because the motor was overreved, or the rod cap or bearing just gave out. Watching this video makes me wish I had at least upgraded to ARP rod bolts when i put my motor together. Oh well, I'll bet that rod shooting through the side of the block looks even better in person. Nice example of how much the 4g63 can take though, thanks for sharing squeak10686.

You are right. The rod bolts will be the first to let go and is the weak link in a rod as well as the parting line. Also the part on the rod wear the beam tapers down to the piston pin is another weak area because of lesser material. Its hard to say what was the first part that failed because so many broken pieces in the end.

 

[awdwhip]

that vid was sweet. RIP 7-bolt.

 

[Matts95TSiAWD]

wasnt that awd???

or was the driveshaft disconnected?

 

[92GSXBaltimore]

I wouldnt go saying that "detonation has little effect on the steel rod beneath the piston.", Superbeast406. If the rod is trying to push the piston up against all that force of an already burning air/fuel mixture(detonation), on top of high revs, I wouldnt call that "little effect". Especially on toothpick 7bolt rods.

 

[TSIfreek]

Nice! tooth pick 7 bolt rods

 

[92awddsm]

Wrong, detonation has little effect on the steel rod beneath the piston.

And I guess you know this for a fact from experience? I just pulled apart a ford 347 stroker that suffered a case of detonation. The damage was a brokek plug, broken upper compression ring, beat up rod bearing, and broken main cap adjoining that particular cylinder. I have also seen other race engines that have broken cranks, rods, pistons, wrist pins, cyliders, etc from detonation. So with that being said, I know I am not wrong. By the way, I also have 13 yrs experience with building race engines of all types. What experience do you have that makes you say I am wrong?

 

[92GSXBaltimore]

wasnt that awd???

or was the driveshaft disconnected?

the latter

 

[squeak10686]

And I guess you know this for a fact from experience? I just pulled apart a ford 347 stroker that suffered a case of detonation. The damage was a brokek plug, broken upper compression ring, beat up rod bearing, and broken main cap adjoining that particular cylinder. I have also seen other race engines that have broken cranks, rods, pistons, wrist pins, cyliders, etc from detonation. So with that being said, I know I am not wrong. By the way, I also have 13 yrs experience with building race engines of all types. What experience do you have that makes you say I am wrong?

13 years of race engines and you cant even put a dsm into the 11's

take it easy man, were all hear for the same purpose because we love these cars. thanks for your advice. there was no mushrooming around the piston which is the first MAJOR signs of detenation.

 

[tstkl]

13 years of race engines and you cant even put a dsm into the 11's

take it easy man, were all hear for the same purpose because we love these cars. thanks for your advice. there was no mushrooming around the piston which is the first MAJOR signs of detenation.

some of us arent in it for dragging. what if his dsm in his dd, or if its track preped and he wants some lower speed accelleration for turns and stuff.

 

[Awdboost]

if 12.3 AFR is lean on 114 which it is not...

What was the timing like? I would tune that lean on 114.. But it's got lots to due with timing.

 

[92awddsm]

13 years of race engines and you cant even put a dsm into the 11's

How does my car's performance dictate my level experience? I guess if I wasted more time and $ on it, I am sure that it would run 11's consistently. Instead, I chose to spend my time and $ on my wife and son. And yes, my car has and still can run 11's on pump gas. My only limiting factor is traction.

 

[tstkl]

How does my car's performance dictate my level experience? I guess if I wasted more time and $ on it, I am sure that it would run 11's consistently. Instead, I chose to spend my time and $ on my wife and son. And yes, my car has and still can run 11's on pump gas. My only limiting factor is traction.

most awd cars dont have traction problems while attempting an 11 second time slip do they?

 

[92awddsm]

most awd cars dont have traction problems while attempting an 11 second time slip do they?

I do on all season radials. Give me your email and Ill send you the video.

 

[90AWDTalon]

most awd cars dont have traction problems while attempting an 11 second time slip do they?

Not the same kind of traction problems that 2 wheel drive cars have. But at that power level it is pretty easy to spin the tires. I haven't run a 1/4 mile on my current setup, but in the 1/8 were I've run 7.5, a lauch with the rpm's too high leads to massive wheel spin. And it is hard to put power to the ground comming out of corners while autoXing, even with R-compound tires.

 

[Turbo Monk3y]

I run a 12.01 @ 117 and cut 1.85 60 foots and i dont get traction till 2nd gear. If i got traction 117trap is good enough for mid 11.

 

[92awddsm]

I run a 12.01 @ 117 and cut 1.85 60 foots and i dont get traction till 2nd gear. If i got traction 117trap is good enough for mid 11.

Thats why I have yet to turn the boost up and run race gas. If I have traction issues on low boost with pump gas, why even try?

 

[tstkl]

Thats why I have yet to turn the boost up and run race gas. If I have traction issues on low boost with pump gas, why even try?

for kicks and giggles?

[email protected]

 

[TSIfreek]

Please post the vid if you would

 

[92awddsm]

Please post the vid if you would

http://media.putfile.com/Last-trip-out-pump-gas-poor-tune You can see the smoke rolling off the tires on the launch. Tires spun through 1st and second.

 

[nanokpsi]

Something was Obviously wrong if it took 35psi to make that number.

Stock 7bolts have done over 500 to the wheels.

When I had my SCM6152 ans stock 2g intake manifold, it took 27-28 psi on c16 to make 400whp. The numbers seem fine to me.

 

[91dsmtalon]

Regardless it was an impressive feat, he hadn't even got to spray and make his real numbers. Everyone in omaha is impressed with him, hes done good. I think what the conclusion may have been was clutch slippage caused free rev, and that was the ultimate problem. It wasn't running lean, and there was no detonation. I wasn't there, but have seen some of the convos on the boards. Thats the general gist I got.