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Old 09-19-2017, 02:07 PM   #26
linuxman51
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Quote:
Originally Posted by John V, outside agitator View Post
Typical..no a whisper of what gearbox ratios and final drive the car has...or any thoughts on optimising that..

Acc is about torque to the wheels.
Motor makes T torque, and it gets multiplied by first the gearbox then the final drive..

And everybody steadfastly ignores its rle in making for a quicker car.

Amazing.
If only we knew what the ratios are in the OEM boxes...

Quote:
3300 stall converter with Aw72L trans
3.73 rear
John, you're slipping in your old age.
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Old 09-19-2017, 02:09 PM   #27
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there's a wiki for the boxes.
https://en.wikipedia.org/wiki/Volvo_....5B1.5D.5B2.5D

your problem is not gear ratios if you're running 2bar boost and only trapping 97mph. that is the first thing you need to sort out.
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Old 09-19-2017, 02:11 PM   #28
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I'll get my 60 ft back down to 1.8 but looks like people have had better luck than me making their bricks turn better numbers still on the old LH2.4. I'll check on the boost leak but the car still holding 25psi at the throttle body to redline so it's holding quite a bit of boost.
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Old 09-19-2017, 02:16 PM   #29
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You can make your targeted boost pressure and have a boost leak at the same time. I trapped at 111 mph my first time at the strip. Two weeks later I couldn't get above 106 mph. When I got home, I found a boost leak. I didn't see any problems on the boost gauge. The turbo will make what the wastegate tells it to make regardless.
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Old 09-19-2017, 02:27 PM   #30
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Was it a pretty decent boost leak?
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Old 09-19-2017, 02:30 PM   #31
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Maybe your converter or trans is slipping slightly?
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Old 09-19-2017, 02:30 PM   #32
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Quote:
Originally Posted by swedish-rocket View Post
Was it a pretty decent boost leak?
It wasn't huge, but I could hear it on the freeway.
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Old 09-19-2017, 02:32 PM   #33
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1.8 would cut your et down, but that trap speed is abysmal for the mods/boost (which for the most part are fairly basic). unless something is waay off (like the cam timing being off a tooth), the setup should rip. being that it's a td04 turbo, with a t3 super 60 "esque" wheel (based on the inducer/exducer numbers). With that stall converter, you should actually have traction problems launching if you're giving it the whole stick
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Old 09-19-2017, 02:40 PM   #34
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I was hoping the turbo was enough for this build. I like how it makes power at lower RPMs. I had a 46trim garret turbo with a .48 housing on my spirit rt and below 3000 RPMs it wasn't powerful. I got a lot invested in it and I'd rather not sell it.
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Old 09-19-2017, 03:00 PM   #35
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turbo is probably alright, you need to start looking at things to ensure they are what you believe them to be
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Old 09-19-2017, 03:04 PM   #36
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Quote:
Originally Posted by swedish-rocket View Post
I'm not sure what to even do about that John other than going to manual or change out the rear end. I got an Aw72L 3300 stall and 3.73 rear.
Yeah well what has the greatest effect on acc as the car gets going?
How do you thing nasty real Pro-stock drag cars would go if they had sky high axel ratios and overdrives in them---they'd be slow...
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Old 09-19-2017, 03:11 PM   #37
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turbo is probably alright, you need to start looking at things to ensure they are what you believe them to be
That's where you guys have been helpful because there really isn't many people around me that knows these cars. I was thinking that this best I can do with my sum of parts. I'll look into all what has been said.
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Old 09-19-2017, 03:12 PM   #38
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Quote:
Originally Posted by swedish-rocket View Post
That's where you guys have been helpful because there really isn't many people around me that knows these cars. I was thinking that this best I can do with my sum of parts. I'll look into all what has been said.
nah that's not the best it'll do.
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Old 09-19-2017, 03:35 PM   #39
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Quote:
Originally Posted by John V, outside agitator View Post
Yeah well what has the greatest effect on acc as the car gets going?
How do you thing nasty real Pro-stock drag cars would go if they had sky high axel ratios and overdrives in them---they'd be slow...
Torque gets you going. I'm sure the setup was optimized for smooth acceleration and mpg. Still people have had decent success with these aw transmissions with similar setups. Maybe it could be the next step for me to replace the transmission once I figure out why I'm not making the power. Though maybe I'm losing it from the transmission.

Last edited by swedish-rocket; 09-20-2017 at 08:23 AM..
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Old 09-19-2017, 03:40 PM   #40
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you're not losing that much through the box


edit: unless the box is smoked, but then it's fairly obvious what's going on. the aw's don't tolerate slip for very long at all.
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Old 09-19-2017, 04:03 PM   #41
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Truth! I killed a few aw71s due to slip. Accumalator mod and two transmission coolers have done wonders on saving my current one.
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Old 09-22-2017, 09:51 PM   #42
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I got huge leak going pass the BOV into the outside atmosphere. I just pressure tested it.
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Old 09-22-2017, 10:18 PM   #43
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I agree stiffen lighten. is that 3.73 an lsd?
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Old 09-22-2017, 10:24 PM   #44
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Not a LSD yet though I'm not having traction issues.
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Old 09-22-2017, 11:04 PM   #45
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Your issue isn't gearing, it is that turbo. 25psi on a big compressor is going to choke the life out of that little tdo4. They are great 200whp turbos but you are starting to push things beyond that.

I offer some economical billet t3/t4 turbos in the $700 range that can be sized to your desired performance. If it were me I would stretch the budget a bit more and go for a borg warner sxe. Just outside your price range form Full Race but worth the additional cost in my opinion.
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Old 09-22-2017, 11:19 PM   #46
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I'm going to give the turbo more time on the car and figure out how to fix the bpv problem. I put soap water around the turbo. It didn't just bubble it shot soap water everywhere during a pressure test. I wonder if there are better direct replacement recirculating BPV's for these cars?
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Old 09-23-2017, 12:14 AM   #47
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How much faster would you like to go?
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Old 09-23-2017, 12:16 AM   #48
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13.2 to 12.9 is my goal
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Old 09-23-2017, 12:25 AM   #49
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Quote:
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13.2 to 12.9 is my goal
You could do that on a 13c. Turbo really isn't your problem. Something isn't working/running right.
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Old 09-23-2017, 12:29 AM   #50
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I hope the huge boost leak is the culprit. I though the 20T was enough turbo for a 12 so that's why I bought it.
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