New video of my 4" exhaust

[boost geek]

I just got this video today from my 12.2 run at Mission on Sept 17/10. This was taken by my friend's wife, who was more focused on the burn out than the full run, as you will see.
I just love the sound of this engine/exhaust set up, it's banging off the 7200 rev limiter, also running no bov, as you'll hear when I let off in the burn out box.
Crank the volume! :eyebrows:


http://www.youtube.com/watch?v=cXWQy2v5Zp8

[puppet]

Nice .... you're just a fine tune away from 11's bud!:thumb:

[bakes]

You need a some higher gear ratio , 1st is just to short !!!!

[boost geek]

I have all the stuff to make a hybrid 520/555 3.50 tranny, but I wonder if it will be worth doing. Right now I trap at about 6 grand in 4th gear, what rpm will I be trapping at in a hybrid tranny?

[Juggy]

I have all the stuff to make a hybrid 520/555 3.50 tranny, but I wonder if it will be worth doing. Right now I trap at about 6 grand in 4th gear, what rpm will I be trapping at in a hybrid tranny?

something more 5200rpm.....

btw, i dont think u got them tires hot enuff dude!! lol

[boost geek]

5200 in a hybrid? With 24.5" slicks? It may work for me then...:eyebrows:

[Juggy]

5200 in a hybrid? With 24.5" slicks? It may work for me then...:eyebrows:

just a quick guesstimate. id fill in a gear calculator and tell ya the actual # but im too lazy right now :lol:

anyway, let me ask you this question. if your car is making power to 7200rpm and your still planning to bump up that rev limiter. why on earth would you want to come through the traps 2000rpm lower??
if your sticking with the power your at now, then yeah you could rip through the traps in 3rd gear. but if you go any faster your gonna find yourself burnin through 4th gear at a low rpm

---------- Post added at 08:36 PM ---------- Previous post was at 08:35 PM ----------

in a PM discussion with Shadow, he had told me that hes used BOTH the 568 on a 3.85 and a 3.50 gear. the 3.85 netted 5 more mph
maybe he can chime in on this....

[boost geek]

I havent built a hybrid because I don't know if it will be better for me or not. I was planning just to run my 520 3.50 again this season. If the hybrid would be better, I could run that instead, but I would need more feedback before I go that route.
I could just weld the diff on the stock 555 and run 3.85's with a moly end plate...

[Juggy]

oh crap. no posi??? sorry i keep forgetting how expensive the quaifes are!!! lol.....i got lucky and picked up a slightly used one for less then the price of an OBX :D

you could always just get a n/a fd from a 520?? i thought they had a 3.87 or something like that....

[boost geek]

I could just weld the 555, then I have 2 complete tranny's incase I pop one.
Bakes has a 3.87 520 kicking around his garage.:eyebrows:

[Juggy]

your built your car to rev, so why bother killing it with longer gears!!

[boost geek]

Ya, just first gear seems so low, guess I gotta slam the gears faster.

[turbovanman²]

Ya, just first gear seems so low, guess I gotta slam the gears faster.

Start off in 2nd.

This video doesn't do the sound justice, its LOUD, lol, but sounds great. :nod:

[Ondonti]

Yes Juggy, this long gear transmission advice is terrible, it always has been. Unless you plan on never using 4th gear, its a junk idea. You have to do SOOO much regearing and you only gain a few mph in 1st, and ruin every other gear. The point of that is what if you STILL have to shift to 2nd and 3rd and 4th?

If someone was smart enough to combine a long gear transmission with NEVER using 4th gear, it could make sense. If you can't rev high enough to match your power level, bad idea.
I could go that route but I don't want a hybrid trans just for a silly reason like that, and it would limit my MPH to whatever my RPM limit was. I can calculate out about 138mph on 26" slicks (pretending they won't grow) and 8000 rpms on a 1.28 ratio 3rd gear and 3.50 final. But 4th gear would go to 188mph with no tire growth, and 200+mph if the tire grew 2". What in the world do we need gear ratios like that for? Thats a lot of work but it could do 130 on 24.5's.
7200rpm will only do 117mph on 24.5's so...that would be dumb.

Doing all that so you can go 53mph in 1st gear instead of 49mph with a normal trans. Ridiculous, yes. You have no tire growth in 1st gear so the gearing will just get progressively worse as you shift.

You are already looking at 144mph in 4th if you don't change your limiter and ignore tire growth, probably near 150 with growth. Do you need that long 4th gear? Will going 4mph faster in 1st gear improve your shift? No.

[boost geek]

Ahhhh, that's what I had to hear. Scrap the hybrid idea. :nod:
I've thought about starting in second, but scared I'm gonna scatter parts over the starting line.

[Ondonti]

I have had the same temptation to try 2nd but never heard of anyone doing it aggressively enough for it to work or break stuff.

[Juggy]

Yes Juggy, this long gear transmission advice is terrible, it always has been. Unless you plan on never using 4th gear, its a junk idea. You have to do SOOO much regearing and you only gain a few mph in 1st, and ruin every other gear. The point of that is what if you STILL have to shift to 2nd and 3rd and 4th?

If someone was smart enough to combine a long gear transmission with NEVER using 4th gear, it could make sense. If you can't rev high enough to match your power level, bad idea.
I could go that route but I don't want a hybrid trans just for a silly reason like that, and it would limit my MPH to whatever my RPM limit was. I can calculate out about 138mph on 26" slicks (pretending they won't grow) and 8000 rpms on a 1.28 ratio 3rd gear and 3.50 final. But 4th gear would go to 188mph with no tire growth, and 200+mph if the tire grew 2". What in the world do we need gear ratios like that for? Thats a lot of work but it could do 130 on 24.5's.
7200rpm will only do 117mph on 24.5's so...that would be dumb.

Doing all that so you can go 53mph in 1st gear instead of 49mph with a normal trans. Ridiculous, yes. You have no tire growth in 1st gear so the gearing will just get progressively worse as you shift.

You are already looking at 144mph in 4th if you don't change your limiter and ignore tire growth, probably near 150 with growth. Do you need that long 4th gear? Will going 4mph faster in 1st gear improve your shift? No.

lol, thanks brent! def sums up what I was getting at.

I dont think Id ever try leaving the line in 2nd. theres been a few people that have tried it and they didnt really gain anything...

dick. now if you can get your hands on a 568 gearset, and combine that with a 3.77 fd it would be something to think about :D thats what i had in store for my next trans. the 3.50 is just plain overkill

[turbovanman²]

Ahhhh, that's what I had to hear. Scrap the hybrid idea. :nod:
I've thought about starting in second, but scared I'm gonna scatter parts over the starting line.

Get a real trans or just go auto, :evil:

I would get ahold of Badass, Pat, Shadow, MockGLH, Reeves etc and see what they are doing, especially Mock, Shadow and Reeves as they are driving L body's.

[bakes]

Paging DR.Badass, Pat, Shadow, MockGLH, Reeves to the O.R. Paging!!!!!!!!!!!!!!

[Opticon]

Wow, and I thought my 3" tone was deep... That sounds damn nice.

[OmniLuvr]

i know you arent having traction problems (i dont think?), but what if you ran a taller slick instead of replacing a tranny? sounds like a better idea to me? or will you have to many clearance issues?

[Juggy]

you can run a 26" slick on an L body with coilovers. turning radius isnt quite great thO! lol

[shadow88]

i know you arent having traction problems (i dont think?), but what if you ran a taller slick instead of replacing a tranny? sounds like a better idea to me? or will you have to many clearance issues?

That's the idea! Make up the top end ratio with the tires. If you're happy where you are, leave it. Changing to a lower numerical gearset will net you LESS torque multiplication any way you slice it.

When I had a hybrid trans is was awesome to go hunting on the hyway, but otherwise, not good for acceleration. I topped out 220kph in 4th at 6000 rpms.

If your trap rpm is good, it's the starting line technique you need to work on.

Take it from someone who knows they need to work on the starting line. ME. I have an 11 second car, but I'm a 12 second driver. I think you're pretty close too.

[Evilancer]

Sounds pretty good man. Is it 4" turbo back, or just after the down pipe?

Jon

[boost geek]

3" downpipe, 3 1/2" flexpipe, (thanks Bakes!), 4" remainder.
http://i91.photobucket.com/albums/k302/boostgeek/100_3949.jpg

http://i91.photobucket.com/albums/k302/boostgeek/100_3953.jpg

http://i91.photobucket.com/albums/k302/boostgeek/100_4073.jpg
The muffler is a Dynomax 4" Race Bullet.
I wanted to try and simulate an open downpipe.

[Evilancer]

That looks pretty nice. I run a 3" race bullett on my car, its all the muffler you need on these cars! What turbo is that, HX35?

Jon

[Juggy]

that looks pretty nice. I run a 3" race bullett on my car, its all the muffler you need on these cars! What turbo is that, hx35?

Jon

he351

[turbovanman²]

he351

HX35, its in his avatar too, :p

[Evilancer]

Thought so. Turbine housing looked too big to be a HE351.

Jon

[Vader85]

I just got this video today from my 12.2 run at Mission on Sept 17/10. This was taken by my friend's wife, who was more focused on the burn out than the full run, as you will see.
I just love the sound of this engine/exhaust set up, it's banging off the 7200 rev limiter, also running no bov, as you'll hear when I let off in the burn out box.
Crank the volume! :eyebrows:


http://www.youtube.com/watch?v=cXWQy2v5Zp8

awesome!!!!!!!!

[Vader85]

How much more MPH did you gain? How much ET did you drop?

[boost geek]

Thanks!
I'm now running a dual flange Volvo bov "backwards". It can never leak under high boost, the boost pressure pushes the puck closed instead of trying to push it open.

I went from 13.6@104 to 12.25@117.7, but that was with multiple changes: exhaust, Holset HX35, ported intake manifold, cam, beehives, 4 puck clutch, and maybe other things which I forget right now...

[30 PSI SHADOW]

I love the 3:50. I do my burnout in 2nd. I have 23.5" slicks and a purple plate. 1.72 60ft times. I leave in 1st though. im trappin 122 now

[Shadow]

Can't believe I'm only seeing this now! lol I must say, that exhaust note sounds distinctly familiar.......:eyebrows:

I'm still running a completly stock 568 with quaife. As far as I can tell, the only time a hybrid is going to help is if your having traction problems and/or if it hooks you better through the first two gears. You give up some MPH for lower ET. (just like the auto's, kind of)

Other than that, I'm in agreement with what others have said. If your not running out of RPM in 4th gear, it's not necc.

I decided to go to 26" slicks instead because I couldn't air down the 24's (on 15" rims) low enough without them looking flat. (got hassled by the track officials more than a couple times)

With 7psi in the 26's, they look like the 24's with 11-12psi! Anything under 9psi in the 24's and they would look flat between runs.

I have a built hybrid ready to go, but will only try it when I have what I believe is the best ET out of the car. Then I'll swap with nothing else changed and see what the difference is.

[bakes]

The last run i got to drive it Me bad i launched in 3rd slugged it out of the hole untill 1/4 track then went like a bat out of hell at 35psi untill i blew the inlet Fmic coupler then i shut it down at 1/2 and coasted it to a 14.7 at 87. but on a side note i found the weak link lol