Lsj/tvs engine build #2
09-04-2013, 07:04 PM
#52
I 100% beleive that a forged piston for high horsepower builds is a smart thing to do, but in fact the oil control from the stock piston has proven better for me than the diamond piston ring package. But that just means I use a litre of oil every 3000 miles rather than practically none...
09-04-2013, 07:11 PM
#54
I would talk to Harrop and ask Julian. Or someone like eBristol who can read blower maps. I cant. There has to be a reason Harrop dont think that anything less than 2.9 is worth doing.
It could be they dont want their stuff to spin too fast for reliability. Or it could be heat. The capacity of the 1320 Harrop, as I understand it, is way beyond what people feed it with pump gasoline.
Time Attack ran a stage 3 pulley fyi. The smaller pullies than that got discarded in engine testing. That may mean something, it was a tvs and it did run a very fine nitrous setup.
it did blow up as well in the end. we were done, finished, put Tarzan and the Evo's firmly back on the trailer, unable to even think about approaching the Cobalt's fast time, which lasted a few years at Buttonwillow.
But the Chev. program manager had to have Heinricy do another run, could be just because he wanted to show he was important and could have it happen.
boom.
It could be they dont want their stuff to spin too fast for reliability. Or it could be heat. The capacity of the 1320 Harrop, as I understand it, is way beyond what people feed it with pump gasoline.
Time Attack ran a stage 3 pulley fyi. The smaller pullies than that got discarded in engine testing. That may mean something, it was a tvs and it did run a very fine nitrous setup.
it did blow up as well in the end. we were done, finished, put Tarzan and the Evo's firmly back on the trailer, unable to even think about approaching the Cobalt's fast time, which lasted a few years at Buttonwillow.
But the Chev. program manager had to have Heinricy do another run, could be just because he wanted to show he was important and could have it happen.
boom.
09-06-2013, 02:07 PM
#58
The majority of TVS owners are between 2.2 - 3.0 PR (17 - 29 psi)
3" tvs pulley
Stock 6.5" crank pulley
7500 RPM redine
TVS RPM = 16,250
Assuming a 3" puts you around 18-20 PSI
Plug that into the graph to see the uphill battle supercharged LSJs have to deal with daily in terms of efficiency.
This chart doesn't show blowers temperature :/
3" tvs pulley
Stock 6.5" crank pulley
7500 RPM redine
TVS RPM = 16,250
Assuming a 3" puts you around 18-20 PSI
Plug that into the graph to see the uphill battle supercharged LSJs have to deal with daily in terms of efficiency.
This chart doesn't show blowers temperature :/
09-06-2013, 02:10 PM
#60
But you're just going to blow the tires away. A larger pulley will still instantly hit; especially when backed with a progressive shot of nitrous.
On the track/canyon you're trying to avoid smoking the tires through turns.
The quickest cars out here in the local canyons are usually the ones with significantly less torque.
09-07-2013, 04:59 AM
#71
Surprised there isn't more commentary about the upper cylinder support.
Oh so as Trevor mentioned...
Short block is ready
Trend performance wrist pins arrived. Time to balance and begin assembling.
Reminds me... I need to drain the gas tank of the old e85
Oh so as Trevor mentioned...
Short block is ready
Trend performance wrist pins arrived. Time to balance and begin assembling.
Reminds me... I need to drain the gas tank of the old e85
09-07-2013, 08:18 AM
#75