MPH prediction on my engine
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 2,238
Likes: 4
From: Milan
MPH prediction on my engine
396 c.i. (small block bored to 4.030 x 3.875)
brodix 200 heads race rite
230-236 hyd roller 110 centerline 112 LSA, 580 lift w/1.6rr
3000 rpm stall converter an a 700r4.
-fully ported Superram-
I have a 3.45 rear, end 315/35-17 tires.
Should i cross the finish line in third without shifting in overdrive?
-Beppe-
brodix 200 heads race rite
230-236 hyd roller 110 centerline 112 LSA, 580 lift w/1.6rr
3000 rpm stall converter an a 700r4.
-fully ported Superram-
I have a 3.45 rear, end 315/35-17 tires.
Should i cross the finish line in third without shifting in overdrive?
-Beppe-
Last edited by conv90; Sep 3, 2007 at 04:53 AM.
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 2,238
Likes: 4
From: Milan
Is it reasonnable 117-118 mph?
I made an excel sheet and made some calculation.
With 25.70" tires and 3.45 gears , 5500 rpm in D are 121 mph.
Yes, this is assuming 0 slippage with the torque converter...
Tipical % slippage?
--...I really don't want to shift in OD..
-Beppe-
I made an excel sheet and made some calculation.
With 25.70" tires and 3.45 gears , 5500 rpm in D are 121 mph.
Yes, this is assuming 0 slippage with the torque converter...
Tipical % slippage?
--...I really don't want to shift in OD..
-Beppe-
Race Director
Joined: May 2003
Posts: 10,749
Likes: 41
396 c.i. (small block bored to 4.030 x 3.875)
brodix 200 heads race rite
230-236 hyd roller 110 centerline 112 LSA, 580 lift w/1.6rr
3000 rpm stall converter an a 700r4.
-fully ported Superram-
I have a 3.45 rear, end 315/35-17 tires.
Should i cross the finish line in third without shifting in overdrive?
-Beppe-
brodix 200 heads race rite
230-236 hyd roller 110 centerline 112 LSA, 580 lift w/1.6rr
3000 rpm stall converter an a 700r4.
-fully ported Superram-
I have a 3.45 rear, end 315/35-17 tires.
Should i cross the finish line in third without shifting in overdrive?
-Beppe-
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
Is it reasonnable 117-118 mph?
I made an excel sheet and made some calculation.
With 25.70" tires and 3.45 gears , 5500 rpm in D are 121 mph.
Yes, this is assuming 0 slippage with the torque converter...
Tipical % slippage?
--...I really don't want to shift in OD..
-Beppe-
I made an excel sheet and made some calculation.
With 25.70" tires and 3.45 gears , 5500 rpm in D are 121 mph.
Yes, this is assuming 0 slippage with the torque converter...
Tipical % slippage?
--...I really don't want to shift in OD..
-Beppe-
When I cross at 115 I am turning 6450 rpm according to data master. However, the two main differences would be, 1. I had 4.09 gears. 2. I was running on ER Street Bias tires 26x11.50x15 and I believe that the bias plys actually grow with speed compaired to a radial. I have no idea if this is true, but I was told that the bias plys will slow rpms by about 200 compaired to a radial of same size.
I believe you can make a fairly accurate comparison with the gears, but at any rate, shifting into overdrive kills your track times. IMO I would overrev it a little past 5500 to keep from shifting.
Good luck, and let us know how it runs!!
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 2,238
Likes: 4
From: Milan
When I cross at 115 I am turning 6450 rpm according to data master. However, the two main differences would be, 1. I had 4.09 gears. 2. I was running on ER Street Bias tires 26x11.50x15 and I believe that the bias plys actually grow with speed compaired to a radial. I have no idea if this is true, but I was told that the bias plys will slow rpms by about 200 compaired to a radial of same size.
I believe you can make a fairly accurate comparison with the gears, but at any rate, shifting into overdrive kills your track times. IMO I would overrev it a little past 5500 to keep from shifting.
Good luck, and let us know how it runs!!
I believe you can make a fairly accurate comparison with the gears, but at any rate, shifting into overdrive kills your track times. IMO I would overrev it a little past 5500 to keep from shifting.
Good luck, and let us know how it runs!!
The track is not a real drag strip... it's an airport, so the "track" will be not prepped, it's like a normal street with a real christmas tree.
I'm not expecting 60 foot lower than 2,00 or 1,90 secs.
The important is to do the better ET than my friends
-Beppe-
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 2,238
Likes: 4
From: Milan
Here the Excel I made:
You only need to change the rpm and the tire diameter and the rear ratio.
It's European Excel, soI dont know how the separator of thousands and decimals are managed.... here we say 1.000,00
you say 1,000.00
-Beppe-
You only need to change the rpm and the tire diameter and the rear ratio.
It's European Excel, soI dont know how the separator of thousands and decimals are managed.... here we say 1.000,00
you say 1,000.00
-Beppe-
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 2,238
Likes: 4
From: Milan
Dyno 2000 say 501 fly torque at 4000 and 479 flywheel HP at 5500.
BTW, I used the long runner TPI as Intake.
If I use a tunnel ram I have over 560 HP (6000 to 6500 rpm).
-Beppe-
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Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 2,238
Likes: 4
From: Milan
best Mph 113.xx and best ET 12.30.
I'm satisfied.
I made 5 passes all 12.3xx, the only 12.4xx was the final race to say the winner.
I lost in FINAL with a Nissan Sunny GTr turbo with a turbo pressure put at the limit of the explosion...
)
No 60ft times
I'm happy about the car because:
The track (an Airport ) was not prepped at all, a normal asphalt strip.
I'm sure the 60 times are not under 1.9 - 2.0 sec.
the temp was around 90-92 °F
in a humid sunny sunday (yesterday).
I won against a pontiac firebird 502 with NoS in the semi-finals.
I always let the shifter in D letting the car shifting itself.
It's my first time in the 1/4 mile.
The tune is far to be perfect.
-Beppe-
I'm satisfied.
I made 5 passes all 12.3xx, the only 12.4xx was the final race to say the winner.
I lost in FINAL with a Nissan Sunny GTr turbo with a turbo pressure put at the limit of the explosion...
)No 60ft times
I'm happy about the car because:
The track (an Airport ) was not prepped at all, a normal asphalt strip.
I'm sure the 60 times are not under 1.9 - 2.0 sec.
the temp was around 90-92 °F
in a humid sunny sunday (yesterday).I won against a pontiac firebird 502 with NoS in the semi-finals.
I always let the shifter in D letting the car shifting itself.
It's my first time in the 1/4 mile.
The tune is far to be perfect.
-Beppe-
Race Director
Joined: Feb 2004
Posts: 12,517
Likes: 19
best Mph 113.xx and best ET 12.30.
I'm satisfied.
I made 5 passes all 12.3xx, the only 12.4xx was the final race to say the winner.
I lost in FINAL with a Nissan Sunny GTr turbo with a turbo pressure put at the limit of the explosion... )
No 60ft times
I'm happy about the car because:
The track (an Airport ) was not prepped at all, a normal asphalt strip.
I'm sure the 60 times are not under 1.9 - 2.0 sec.
the temp was around 90-92 °F in a humid sunny sunday (yesterday).
I won against a pontiac firebird 502 with NoS in the semi-finals.
I always let the shifter in D letting the car shifting itself.
It's my first time in the 1/4 mile.
The tune is far to be perfect.
-Beppe-
I'm satisfied.
I made 5 passes all 12.3xx, the only 12.4xx was the final race to say the winner.
I lost in FINAL with a Nissan Sunny GTr turbo with a turbo pressure put at the limit of the explosion...
)No 60ft times
I'm happy about the car because:
The track (an Airport ) was not prepped at all, a normal asphalt strip.
I'm sure the 60 times are not under 1.9 - 2.0 sec.
the temp was around 90-92 °F
in a humid sunny sunday (yesterday).I won against a pontiac firebird 502 with NoS in the semi-finals.
I always let the shifter in D letting the car shifting itself.
It's my first time in the 1/4 mile.
The tune is far to be perfect.
-Beppe-
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 2,238
Likes: 4
From: Milan
Thank you Pete!
I'm satisfied also because a manual C6 never made better than 13.2xx
A new Lambo 12.6 - 12.7
A Ferrari F430 (not in the race contest only made 2 or three passes ) with 510 HP and 2800 lbs of weight.. made 12.0xx
Definitively ...a SLOW track...
Andrea with the Dodge SRT10 (the newest 500 HP Viper engine)made all the day 14.3xx and 14.4xx with a best of 14.0xx
-Beppe-
I'm satisfied also because a manual C6 never made better than 13.2xx
A new Lambo 12.6 - 12.7
A Ferrari F430 (not in the race contest only made 2 or three passes ) with 510 HP and 2800 lbs of weight.. made 12.0xx
Definitively ...a SLOW track...
Andrea with the Dodge SRT10 (the newest 500 HP Viper engine)made all the day 14.3xx and 14.4xx with a best of 14.0xx
-Beppe-
Last edited by conv90; Sep 10, 2007 at 09:14 AM.
Race Director
Joined: Feb 2004
Posts: 12,517
Likes: 19
Thank you Pete!
I'm satisfied also because a manual C6 never made better than 13.2xx
A new Lambo 12.6 - 12.7
A Ferrari F430 (not in the race contest only made 2 or three passes ) with 510 HP and 2800 lbs of weight.. made 12.0xx
Definitively ...a SLOW track...
Andrea with the Dodge SRT10 (the newest 500 HP Viper engine)made all the day 14.3xx and 14.4xx with a best of 14.0xx
-Beppe-
I'm satisfied also because a manual C6 never made better than 13.2xx
A new Lambo 12.6 - 12.7
A Ferrari F430 (not in the race contest only made 2 or three passes ) with 510 HP and 2800 lbs of weight.. made 12.0xx
Definitively ...a SLOW track...
Andrea with the Dodge SRT10 (the newest 500 HP Viper engine)made all the day 14.3xx and 14.4xx with a best of 14.0xx
-Beppe-
On a hot day like you describe, my car(on a well prepped track) will normally lose 4-6 tenths of a second compared to a nice 50 degree fall day. I would suspect your combo would like the better air equally as well.
You are also well aware of the 60' vs et part of the equasion. My car lays down 1.620 60' times on a nicer day. If you have an oportunity to drop your 60' times, I suspect a solid mid 11 car or better.
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 2,238
Likes: 4
From: Milan
BTW I'm sure I haven't seen speed over 190 km/h (118 mph)
The manual SRT10 truck (Viper powered ) was only 160 km/h (100 mph)
Is it possible to have a track that is "slow" also for speed?
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 2,238
Likes: 4
From: Milan
I would bet that everyone was suprised to see you running with the Ferrari
On a hot day like you describe, my car(on a well prepped track) will normally lose 4-6 tenths of a second compared to a nice 50 degree fall day. I would suspect your combo would like the better air equally as well.
You are also well aware of the 60' vs et part of the equasion. My car lays down 1.620 60' times on a nicer day. If you have an oportunity to drop your 60' times, I suspect a solid mid 11 car or better.
On a hot day like you describe, my car(on a well prepped track) will normally lose 4-6 tenths of a second compared to a nice 50 degree fall day. I would suspect your combo would like the better air equally as well.
You are also well aware of the 60' vs et part of the equasion. My car lays down 1.620 60' times on a nicer day. If you have an oportunity to drop your 60' times, I suspect a solid mid 11 car or better.
I haven't a datalog of the 1/4 passes, but the day before I made some WOT datalog (in the street..) just to see which rpm the 2 to 3 shift was.
I read 5400-5500. ..Even if the "feeling " was "too early", I said: "tomorrow I'll let the trans shift itself, 5500 are good enaugh for my SR"
Last year with the 383 and the 219 cam I made some datalog on the 1/8 mile. I tried several times shifting manually at about 5600-5800 at the aftermarket autometer tach.
Then I tried 2 or three times letting the shifter in D and it shifted at 5000-5100. It was 2-3 tenths faster winding manuallly the shift.
Only now I remember that when at home i looked at the datalog the manual shifting reported by datamster were near 6,000 and the automatic shifts were 5200-5300.What I'm trying to say, is that If only yesterday (remembering the 1/8 passes of last year) I used to manually shift to near 5800-(at the tach),
maybe 2 or three tenths were gained.
-Beppe-