The TIII has 8.5:1 doesn't it, should I aim for the same?
The TIII has 8.5:1 doesn't it, should I aim for the same?
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
12:1 Utilize low boost for much higher than average psi/whp gains.
I'd aim for something similar to stock compression. Though I wouldn't be afraid of a few points higher.
“If the people of the nation understood our banking and monetary system, I believe there would be a revolution before tomorrow morning.” -Henry Ford
So what is a stock TIII?
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
http://www.badassmopars.150m.com/RT.html
scroll down.
Says 7.8:1
Reliable information? Who knows.
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
maybe if you shot for 6.0:1 you won't blow it up Simon Sorry have to bust your chops
Simon, what are your goals long term and do you want to run high boost-low compression, or low boost-high compression? The lower the compression, the more "tame" it is and "safe" obviously(you know that), but the better the turbo has to be(flow capacity).
-Nate- ''Sometimes I wonder whether the world is being run by smart people who are putting us on, or by imbeciles who really mean it.'' —Mark Twain
Well its a DD foremost and it would be nice to scoot along without alot of boost, if you know what I mean. I have a nice turbo, stage III wheel, 50 trim, .63 housing and a heavy van. I see some of the Neon hybrids and the 10 sec hybrids are around 8.5:1 thats why I am confused.
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
Well, IIRC you have the auto trans which I'm sure, since you just rebuilt, you're going to keep. Now, I won't lie to you all, I'm not a TD authority by any means, but I'll give you the basics I've learned with my GN turbo experience. Those were very heavy, automatic trans cars, so IMO you focus on a lower compression, but a larger turbo/air-charge. But, those had cast heads, not aluminum, so you had to err on the "low side" because of heat/detonation. My GN is stock and stock compression was 8.5/1 OEM. Now, I would say that you would keep it there or a little lower because it will allow a lower octane gas in non-boost conditions. The aluminum head will shed heat(save gaskets) and if your not running alky you can boost away. Ken Duttweilers 1700 HP Gn had over 30#'s of boost, but low compression. It's much easier to change a piston than a head/block. People focus on boost too much IMO. How often in a true DD are we in boost? maybe 10-15% of the time. Gear it towards the DD side and CAPABLE of the high boost side. It's just like a cam. Go less than you think you should... just my .02.
-Nate- ''Sometimes I wonder whether the world is being run by smart people who are putting us on, or by imbeciles who really mean it.'' —Mark Twain
Thanks I love boost but boost uses fuel, if I can stay out of boost then I can up my fuel economy which I need, lol!
I'll shoot for 8.5:1
Last edited by turbovanman²; 03-03-2007 at 12:54 AM.
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
Agreed, your absolutely right. Just be super careful not to get the "urge" to push it. I've seen an a$$load of pistons with holes in them! The secret is finding the happy medium. Most of the GN guys are looking for tq and not gas mileage..
-Nate- ''Sometimes I wonder whether the world is being run by smart people who are putting us on, or by imbeciles who really mean it.'' —Mark Twain
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
Well, don't let it go to your "head" that the T3 head is "the most superior" either though... After all, it is just a "factory-style" head that has it's own bag of "weaknesses/problems." You already know all that though, so this should be a moot point. The grass ALWAYS looks greener...!!
-Nate- ''Sometimes I wonder whether the world is being run by smart people who are putting us on, or by imbeciles who really mean it.'' —Mark Twain
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
very true... you've been around the block too, so you know what's up... I "concur" with your philosophy on that...
-Nate- ''Sometimes I wonder whether the world is being run by smart people who are putting us on, or by imbeciles who really mean it.'' —Mark Twain
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
You might be surprised how much boost you can safely run with the chamber mods discussed in that other thread, Simon. The higher compression will be more forgiving than you might expect.
Mike
I am going to stick with around 8.5:1, that should be more than enough,
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
Stock compression ratio is 8.1:1......... And this *is* accurate.
considering that you are comming from what?7.8:1CR? and an 8valve
Your going to spool 50trim like a mitsu
And hey if you need more or the turbo doesnt work out
Holset and call it a day