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PostPosted: Mon Jun 19, 2023 4:32 pm 
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Year and Trim: 2004 Pontiac Bonneville SLE.Top Swapped.
Making this for us that want to replicate what that Bonneville did back in the earily 2000s.

So from experence, 4th gear shifts usually happen around 140 MPH. Ive done 150 so far (Recored), But my goal is to see how much till it runs out of gear.

I dont know if anyone has attempted it before, everyones more into 0-60 and quarter miles. I heard rumors that 4 gear pulls can cause grenading but, from my attempts at top speeds and some actual research, I came to the conclusion thats not the case.

If anyone has any idea on whats needed, please post here.


I do know that you need many cooling mods (Trans cooler, 180 t-stat, oil cooler) When doing such a thing. And the correct tires. Lowering the vehicle will help. Remember that the Salt Flat Custom:
Image

Had no body modifcations besides a 3 inch lowering kit and a parashoot, So further body modifcations prob are not needed.
The most important thing ive found out when doing unrecored top speed runs, is that some parts *Cough* power steering release valve *Cough* Will tend to go oof and not work right for abit, if it is original OEM parts.

Yes, this is where im taking my car towards, a more top speed approach. I live in a area where there is very, very long, wide stretches of dead roads, near sea level, so I can prob get some recordings of SAFE top speed runs.

If anyone else has attempted such things, shoot some tips or upgrades.

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2004 Pontiac Bonneville SLE

Top Swapped, Gen5, ZZP front power log, custom rear power log and downpipe, 3.4 pulley, 1.95 rockers, ZZP lifters, big boy trans cooler, 180 themo, Complete AC delete, custom intake, local dyno tune, small other goodies. GXP dash swap, Aftermarket head unit, twin 12 inch kickers, PS2 and Small TV for rear seats.

Top speed is my goal, 150 MPH so far.


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