Cosworth owners - what rpm does your car start to boost?
27-04-2006, 09:53 AM
#1
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Cosworth owners - what rpm does your car start to boost?
my mate was saying the only way you can tell if your car is low comp if you arent sure is by what rpm it comes on boost? mine comes on at 3700rpm,
what does yours come on boost at and can anybody shed any light on the subject
thanks Sarah
what does yours come on boost at and can anybody shed any light on the subject
thanks Sarah
27-04-2006, 10:01 AM
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This is not true. It´s impossible to predict comp ratio by measuring when it hits boost.
3700 is very high. When you say "comes on" do you mean full boost or just beginning to produce boost?
3700 is very high. When you say "comes on" do you mean full boost or just beginning to produce boost?
27-04-2006, 10:15 AM
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no its a t34, its got bd10's and vernier pulleys, though theyve only been set up by eye 
tbh since the cams have been fitted its got a much shorter 1st and 2nd gear but 3rd lasts forever ( goes to 135 in 3rd now )
Sarah
tbh since the cams have been fitted its got a much shorter 1st and 2nd gear but 3rd lasts forever ( goes to 135 in 3rd now )
Sarah
27-04-2006, 10:15 AM
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Originally Posted by YBP
This is not true. It´s impossible to predict comp ratio by measuring when it hits boost.
3700 is very high. When you say "comes on" do you mean full boost or just beginning to produce boost?
3700 is very high. When you say "comes on" do you mean full boost or just beginning to produce boost?
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27-04-2006, 10:18 AM
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I think it´s late anyway? My turbo is bigger than the cossie T4 ( What´s the vital measurements on the rs500 T4? ) and produce boost from appox. 2k. Very slow increase tho before getting past 3k.
27-04-2006, 10:25 AM
#10
Originally Posted by Dicko
no its a t34, its got bd10's and vernier pulleys, though theyve only been set up by eye
tbh since the cams have been fitted its got a much shorter 1st and 2nd gear but 3rd lasts forever ( goes to 135 in 3rd now )
Sarah
tbh since the cams have been fitted its got a much shorter 1st and 2nd gear but 3rd lasts forever ( goes to 135 in 3rd now )
Sarah
.Your car would need to be hitting 9320rpm to do 135mph in third with 215/40 x 17s
. You're just a girl, so I'll let you off though .
27-04-2006, 10:55 AM
#14
DEYTUKURJERBS
Oh dear
Compression ratio has as good as no effect on what rpm the car boosts, despite popular rumour.
ROFL@shorter and longer gears now cams have been fitted tho
Girls are quality, if girls were cleverer life would be boring
Compression ratio has as good as no effect on what rpm the car boosts, despite popular rumour.
ROFL@shorter and longer gears now cams have been fitted tho
Girls are quality, if girls were cleverer life would be boring
27-04-2006, 11:07 AM
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Originally Posted by Itsmeagain
Oh dear
Compression ratio has as good as no effect on what rpm the car boosts, despite popular rumour.
Compression ratio has as good as no effect on what rpm the car boosts, despite popular rumour.
27-04-2006, 11:14 AM
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never really took much notice of mine tbh, but i'm sure it comes on boost at about 2700rpm.
T34.63 BTW with standard cams and, not that it matters Low Comp Pistons
T34.63 BTW with standard cams and, not that it matters Low Comp Pistons
27-04-2006, 11:43 AM
#19
Originally Posted by Dicko
no its a t34, its got bd10's and vernier pulleys, though theyve only been set up by eye
tbh since the cams have been fitted its got a much shorter 1st and 2nd gear but 3rd lasts forever ( goes to 135 in 3rd now )
Sarah
tbh since the cams have been fitted its got a much shorter 1st and 2nd gear but 3rd lasts forever ( goes to 135 in 3rd now )
Sarah
.Ah ive just seen its a girl, dont they believe 4 1/2" is actually 9".
27-04-2006, 11:55 AM
#21
Originally Posted by Alps Pacino
MADRod
Why would you need 700bhp to do 135 in 3rd gear, surely its down to gear ratios and not power
Why would you need 700bhp to do 135 in 3rd gear, surely its down to gear ratios and not power
Forgot to add the winks.
. An old mans attempt at a joke taken tooooooooo seriously. The young lady thinks its true & thats good enough for me. 9k in 3rd on 17" or 8.3k on 19" with low diff, them Hydraulic lifters are doing well .Rod
27-04-2006, 12:03 PM
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Originally Posted by Mike Rainbird
Originally Posted by DOO
Mine comes on boost at around 1600/1700 rpm
.TBH i can`t tell a drop off in boost just don`t get that mid range kick
27-04-2006, 12:31 PM
#23
....to answer the question i'd say you was around 7.2-1 comp on the wrong map...probably an 8-1 map!
...lo comp can affect when the car boosts yes if the map is not set up for the actual compression ratio.
...lo comp can affect when the car boosts yes if the map is not set up for the actual compression ratio.
27-04-2006, 02:00 PM
#26
DEYTUKURJERBS
Originally Posted by Porkie
Originally Posted by Itsmeagain
Oh dear
Compression ratio has as good as no effect on what rpm the car boosts, despite popular rumour.
Compression ratio has as good as no effect on what rpm the car boosts, despite popular rumour.
And thats coming from people running 280 duration cams, no power below 5k, and engines with about twice the BHP compared to torque
27-04-2006, 05:24 PM
#27
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Originally Posted by MADRod
Originally Posted by Dicko
no its a t34, its got bd10's and vernier pulleys, though theyve only been set up by eye
tbh since the cams have been fitted its got a much shorter 1st and 2nd gear but 3rd lasts forever ( goes to 135 in 3rd now )
Sarah
tbh since the cams have been fitted its got a much shorter 1st and 2nd gear but 3rd lasts forever ( goes to 135 in 3rd now )
Sarah
.Ah ive just seen its a girl, dont they believe 4 1/2" is actually 9".
and im not arguing about the speed in 3rd, i know my speedo is also probably a mile out but thats what it reads hitting the limiter in 3rd
Sarah
27-04-2006, 05:26 PM
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Originally Posted by Mike Rainbird
You're just a girl, so I'll let you off though .
.wow i feel so privileged
maybe i should pretend to know jack shit and it'll keep people happier eh Sarah
27-04-2006, 05:48 PM
#30
Originally Posted by Dicko
Originally Posted by Mike Rainbird
You're just a girl, so I'll let you off though .
.wow i feel so privileged
maybe i should pretend to know jack shit and it'll keep people happier eh Sarah
. I think you're also mistaking 4th for 3rd .
27-04-2006, 05:50 PM
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Originally Posted by righthooker
Sarah,you realy should sort out your own user name as i get confused ,to who is on line you or Dicko
as i get confused ,to who is on line you or Dicko SARAH
27-04-2006, 10:17 PM
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135 in 3rd
Dont no everything but sum1 told you a load of bullshit imo.
So its your car now then sarah just with you saying in 1 post mine and in a other post my speedo reads????
with asking a question like that with the poeple on this board e.g. stu , mike and other top tuners was a fate worse than death.
So its your car now then sarah just with you saying in 1 post mine and in a other post my speedo reads????
with asking a question like that with the poeple on this board e.g. stu , mike and other top tuners was a fate worse than death.
28-04-2006, 02:18 AM
#38
Re: 135 in 3rd
Originally Posted by king of bling
asking a question like that with the poeple on this board e.g. stu , mike and other top tuners was a fate worse than death.
28-04-2006, 06:57 PM
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Re: 135 in 3rd
Originally Posted by king of bling
Dont no everything but sum1 told you a load of bullshit imo.
So its your car now then sarah just with you saying in 1 post mine and in a other post my speedo reads????
with asking a question like that with the poeple on this board e.g. stu , mike and other top tuners was a fate worse than death.
So its your car now then sarah just with you saying in 1 post mine and in a other post my speedo reads????
with asking a question like that with the poeple on this board e.g. stu , mike and other top tuners was a fate worse than death.