SC and 4.88's

[belgiumbarry]

SC and 4.88's

just a idea as i see some going on about the subject...

let's not discuss about the super economical overdrive 6the gear with 4.1 ( and can only be used above speed limits... ) ...but a rather high 1ste gear for trafficjam....

i'm i wrong that with 4.88's 2the gear is only a bit bigger then 1ste with 4.1 ? .. so with a SC you can normal ,or race , start in 2the ... and have the 1the for very slow traffic... ????
4.88's are a bit the "normal" ones as you can reach top speed in 5the and 6the is a overdrive... no ? Europ cars are mostly that way...

somebody has this combination or had experience with it ???
thanx for replys ! :rock:

 

[mauiSRT/10]

Marc T has your answer...............I am sure he will chime in. I just have the 4.88's with cat delete and DC Perf computor and the tires just spin in first and second.............traction does not exist at full throttle at all.............with a SC, it must be even worse.......


patrick

 

[belgiumbarry]

Marc T has your answer...............I am sure he will chime in. I just have the 4.88's with cat delete and DC Perf computor and the tires just spin in first and second.............traction does not exist at full throttle at all.............with a SC, it must be even worse.......


patrick

Patrick , with my stock truck now ( 4.1 ) i have to rev it to 3000 and drop the clutch to have spin... no way in just ease the clutch and without a bit reving...
That was my idea ... even with a SC + 4.88's and starting in 2the it must be a bit the same... ?? :dontknow:

 

[mauiSRT/10]

Patrick , with my stock truck now ( 4.1 ) i have to rev it to 3000 and drop the clutch to have spin... no way in just ease the clutch and without a bit reving...
That was my idea ... even with a SC + 4.88's and starting in 2the it must be a bit the same... ?? :dontknow:

At full throttle my truck feels like its driving on ice the rpms go up so fast......its kinda ridiculous really. With a SC......forget it....I cant imagine it would be fun. Not sure about starting in 2nd gear:dontknow: . If you plan on adding a SC, just keep your 4.10's...................me, I dont plan to go the SC route so the 4.88's fit into that plan.

As far as reving up the rpms and dropping the clutch to spin the wheels......not with my setup, just goose the gas and the tires spin in first......... floor it while in second and they break free!! Adding the DC Perf. computor is what really gave me the extra power.......it was my last mod.

patrick

 

[belgiumbarry]

At full throttle my truck feels like its driving on ice the rpms go up so fast......its kinda ridiculous really. With a SC......forget it....I cant imagine it would be fun. Not sure about starting in 2nd gear:dontknow: . If you plan on adding a SC, just keep your 4.10's...................me, I dont plan to go the SC route so the 4.88's fit into that plan.

As far as reving up the rpms and dropping the clutch to spin the wheels......not with my setup, just goose the gas and the tires spin in first......... floor it while in second and they break free!! Adding the DC Perf. computor is what really gave me the extra power.......it was my last mod.

patrick

i can imagine tyre spin with 4.88's comes that easy...but if possible , try once starting in 2nd and let us know .. pleeeeze...:rock:

 

[QuickSilver]

Maybe 4.56:1 would be better with the supercharger, has been for me. :rock:

Quick

 

[ViperTruck2933]

The guage should be bogging of your motor on a hard launch. If you have enough power to launch hard (on sticky tires) with the 4.10s and not bogg the motor down, I'd keep the 4.10s.

If you have just enough power to launch the 4.56s without bogging, I'd stay there.

Etc.....

IMO, this means that stock or with bolt ons, I'd go 4.88. Mild S/C or N/A build I'd go 4.56s. Turbo, highly tuned S/C or Nitrous I'd go 4.10.

 

[belgiumbarry]

i'l bet Patrick will have a good launch starting in 2nd , full throtle and no spin....
now, is he trying it or sleeping ? :dontknow:

 

[mauiSRT/10]

I have started in second by accident..............it sucked. Forget the idea of 4.88's with a SC'r. I would follow Tims advice. Send a Pm to Marc T.

patrick

 

[Prof]

The guage should be bogging of your motor on a hard launch. If you have enough power to launch hard (on sticky tires) with the 4.10s and not bogg the motor down, I'd keep the 4.10s.

If you have just enough power to launch the 4.56s without bogging, I'd stay there.

Etc.....

IMO, this means that stock or with bolt ons, I'd go 4.88. Mild S/C or N/A build I'd go 4.56s. Turbo, highly tuned S/C or Nitrous I'd go 4.10.

Tim is right on...I went to the 4.56 when I added the Detroit Loker rear end. My boost is 5.6 (mild). Advantage of the 4.56 is in traffic or low speed areas...I can get to third and still be at 25 or 30 miles per hour without having to stay in second gear with the revs up. I do think it costs me a few tenths in the quarter mile but not a big thing.

I don't know but would bet (MarcT should know) that with 4.88's you will have to hit fifth gear with a mildly blown engine...with my 4.56 I am pushing up close to the redline in 4th gear...I imagine that with 4.88's and a supercharger that you would have to make that additional shift to keep from hitting the rev limiter in 4th gear....

Somewhere there is a Silverback post that has speed in gears for different axle ratios....yup here it is:

http://www.vtcoa.com/forums/showthread.php?t=32

You would have to hit fifth with a SC and 4.88's.

 

[belgiumbarry]

Tim is right on...I went to the 4.56 when I added the Detroit Loker rear end. My boost is 5.6 (mild). Advantage of the 4.56 is in traffic or low speed areas...I can get to third and still be at 25 or 30 miles per hour without having to stay in second gear with the revs up. I do think it costs me a few tenths in the quarter mile but not a big thing.

I don't know but would bet (MarcT should know) that with 4.88's you will have to hit fifth gear with a mildly blown engine...with my 4.56 I am pushing up close to the redline in 4th gear...I imagine that with 4.88's and a supercharger that you would have to make that additional shift to keep from hitting the rev limiter in 4th gear....

Somewhere there is a Silverback post that has speed in gears for different axle ratios....yup here it is:

http://www.vtcoa.com/forums/showthread.php?t=32

You would have to hit fifth with a SC and 4.88's.

yes Prof, i think you calculate 1/4 times... so you look also not have to shift just at the end.... right ?

What i wanted to know is that with 4.88's starting in 2nd gear is slightly more HP demanding then with 4.11's starting in 1ste... So i wonder why Patrick can't just have a good launch starting in 2nd ?

Perhaps SC needed !?

the ratio 4.88 to 4.11 is 1.19 times " smaller "
the ratio 1ste gear 2.66 and 2nd 1.78 is 1.49 " bigger"

so in fact launch in 2nd gives a 1.49:1.19 = 1.26 "bigger" total gear transfer....

so if we have with SC 26% more power.... ????

( and i can use 1ste to drive a 45° uphill ... )

 

[ViperTruck2933]

Why would you want to start out in 2nd when 1st works just fine? :dontknow:

 

[belgiumbarry]

Why would you want to start out in 2nd when 1st works just fine? :dontknow:

ok, my idea was as we use only 5 gears from the 6 , really , no matter what you have as rear end ratio because either 1ste will be very "small" (4.88's) or 6nd will be very "large" ( 4.11).
So we use 1,2,3,4,...5 , but perhaps there's a better way in using 2,3,4,5,...6
with a rear end ratio suited for this purpose. ( 4.88's ? :dontknow: )
In shifting it is the same number of upschifts ( so equal loss ) .

This could be also achieved ofcourse if we could choose the ratio's of the 6 speed ourselfs but this is a more costly option, if even possible ?
i think.:dontknow:

I do not know if anybody tryed this , perhaps a big secret of the winners ?

You can put it that way : there will be for a given HP and torque a ideal transfer ratio trough "some" gears for the 1/4.Now this transfer ratio is just the product of our gear ratio's x rear end ratio.

Let's play ! :rock: :rock:

So as i now never use 6nd i would never use 1ste with my theorie...

The idea behind it is ofcourse also that we can launch full throttle without spin... i can't imagine that it's better when the driver has to goose the pedal in launching to avoid wheelspin.This is tooo enerving and will only work from time to time:dontknow: :dontknow: ...also in daily driving very dangerous ...

 

[kyle's srt10]

I always start out in first with mine even with the 4.88's. Also even with the gears 6th gear is still only suitable for freeway use At 60mph in 6th gear I am turning about 1300rpms which is too low rpms for that speed

 

[belgiumbarry]

I always start out in first with mine even with the 4.88's. Also even with the gears 6th gear is still only suitable for freeway use At 60mph in 6th gear I am turning about 1300rpms which is too low rpms for that speed

what HP/torque would you have ?
Do you have to avoid wheelspin ?
and can you launch in 2nd ?

 

[Marc T]

Just saw this!

Yep, I have the Roe TSTM and I am running 4:88's.

I don't seem to have the wheel spin that the Stock tires and wheels give to others.

My wheels are Heavier and wider which gives me much better traction than the stockers. It will still spin if you just mash it but if you get into it smoothly she just hooks up and flies.

If your going to the track I would recommend the 4:56's, you will be hitting 5th with this set up!!

As far as launching in second, I have not, nor would I with the clutch issues in these trucks.

I just drop it from 3500-4000 and short shift first. It's a blast to drive!!:rock:

 

[belgiumbarry]

Just saw this!

Yep, I have the Roe TSTM and I am running 4:88's.

I don't seem to have the wheel spin that the Stock tires and wheels give to others.

My wheels are Heavier and wider which gives me much better traction than the stockers. It will still spin if you just mash it but if you get into it smoothly she just hooks up and flies.

If your going to the track I would recommend the 4:56's, you will be hitting 5th with this set up!!

As far as launching in second, I have not, nor would I with the clutch issues in these trucks.

I just drop it from 3500-4000 and short shift first. It's a blast to drive!!:rock:

now that's great news Marc :rock: :rock:
may i ask what wheels/tyres you're using ?

strange that there is so much difference among members : Marc can do it SC+4.88's ( just smoothly ) while others with 4.88's and some mods but no SC speak of driving on ice.... :dontknow:

 

[Marc T]

now that's great news Marc :rock: :rock:
may i ask what wheels/tyres you're using ?

strange that there is so much difference among members : Marc can do it SC+4.88's ( just smoothly ) while others with 4.88's and some mods but no SC speak of driving on ice.... :dontknow:

I had custom Asanti wheels built, the rear is 22 x 11 with 325/40/22's
Front = 22 x 9.5 with 275/50/22's

Wheel and tire combo(rear) weighs 105 lbs!! I think the weight of the wheel and tire helps put down the rubber, but I am sure it affects accelleration some also!!

 

[belgiumbarry]

I had custom Asanti wheels built, the rear is 22 x 11 with 325/40/22's
Front = 22 x 9.5 with 275/50/22's

Wheel and tire combo(rear) weighs 105 lbs!! I think the weight of the wheel and tire helps put down the rubber, but I am sure it affects accelleration some also!!

i know , i'm a pain in the ass ...

:needpics:

sorry....arty:

 

[Marc T]

QUOTE=belgiumbarry]i know , i'm a pain in the ass ...

:needpics:

sorry....arty:[/QUOTE]

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