Quick 5AT question about tiptronic???
#62
10-07-2009, 09:15 AM
It's an automatic transmission with a torque converter. It will never be instant. There's a lot that has to happen before a gear engaged. Not even sequential manuals shift instantly.
Much of the reason people think the automatic upshifts and downshifts are slow is because it's one simple flick. With a true manual, it's far more involved and most manual drivers would be hard pressed to match the shift speed of the 5AT in the G/Z. I'll agree, sometimes the 5AT will second guess your intentions, but it's still the best manumatic auto I've even driven and I rent tons of cars/trucks/SUVs for work.
Much of the reason people think the automatic upshifts and downshifts are slow is because it's one simple flick. With a true manual, it's far more involved and most manual drivers would be hard pressed to match the shift speed of the 5AT in the G/Z. I'll agree, sometimes the 5AT will second guess your intentions, but it's still the best manumatic auto I've even driven and I rent tons of cars/trucks/SUVs for work.
I've had 4 automatic GM cars and 2 automatic G35's and the G35's shift much slower than the GM cars ( one of the GM cars was a cavalier..lol ).
#63
10-07-2009, 12:43 PM
my friend has got a 1994 with only 23K on it... haha but he replaced the tranny already.. and yes 23,000 miles... not 230,000.. it was stored in a warehouse
#64
10-07-2009, 01:28 PM
I dunno...the Pontiac Grand Prix I had would shift pretty much instantly when I would move the lever from 1 to 2 and so on. Heck, the GP even in auto mode would downshift pretty quick when going wot, unlike the G.
I've had 4 automatic GM cars and 2 automatic G35's and the G35's shift much slower than the GM cars ( one of the GM cars was a cavalier..lol ).
I've had 4 automatic GM cars and 2 automatic G35's and the G35's shift much slower than the GM cars ( one of the GM cars was a cavalier..lol ).
#65
10-07-2009, 02:11 PM
I've read about this but have had my doubts as to how much it helped. When I had my GP I altered the accumulator to make shifts hard as hell but to make them even quicker was via the ECU reprogramming. I don't know how that compares to the re5r05a.
#66
10-07-2009, 03:21 PM
There are boatloads of positive reviews for the Transgo VB... I've driven 2 G35s with Stillen VB (dsskyline and DaveO), both shifted way better/faster than my car... Derek (dsskyline) has since gone with transgo - I've haven’t driven his car since the transgo vb, but he says it’s even better than Stillen... so yes, I can assure you it’s worthwhile. The problem is (for me) finding someone to install the kit (not than VB itself, but the shift kit into the VB) for a reasonable price has been difficult... now that Corner 3 is doing it for a fair price, I might consider it.
#67
10-07-2009, 03:33 PM
#68
10-07-2009, 03:58 PM
I too agree that VB don't really change the speed at which transmission shifts based on my own experience. GTM installed my VB (a transgo kit) on my 04 sedan during my supercharger installation. I don't feel it shift any faster or slower (about the same), perhaps just firmer shift.
#69
10-07-2009, 05:14 PM
DaveB is exactly right.
BUT with the right mods, proper grounding kit and a sprint booster, you can have shifts that are pretty much right when you throw it. Those mods will actually make your shifts quite a bit quicker than any 6mt. I don't care if your flash gordon you want shift as fast and as clean as an auto with shift mods.
Too much use of the word shift in that post, I reread twice to make sure I didn't say quick ****.
BUT with the right mods, proper grounding kit and a sprint booster, you can have shifts that are pretty much right when you throw it. Those mods will actually make your shifts quite a bit quicker than any 6mt. I don't care if your flash gordon you want shift as fast and as clean as an auto with shift mods.
Too much use of the word shift in that post, I reread twice to make sure I didn't say quick ****.
#71
10-07-2009, 05:19 PM
IMHO, the sprint booster alters the gas pedal position map so if any of the auto tranny up/down shifts are related to this position, it will too be affected. I've also read that this device also defeats the down shift safety feature so you can actually downshift into an unsafe gear. ie.. downshift into 2nd gear while going too fast.
The TC ecu also alters this map from what I read but doesn't have the liability of taking the downshift safety factor out(I assume). Probably because it's done on the ecu level vs at the sensor level.
The TC ecu also alters this map from what I read but doesn't have the liability of taking the downshift safety factor out(I assume). Probably because it's done on the ecu level vs at the sensor level.
#72
10-07-2009, 05:21 PM
I too agree that VB don't really change the speed at which transmission shifts based on my own experience. GTM installed my VB (a transgo kit) on my 04 sedan during my supercharger installation. I don't feel it shift any faster or slower (about the same), perhaps just firmer shift.
#73
10-07-2009, 05:48 PM
I dunno...the Pontiac Grand Prix I had would shift pretty much instantly when I would move the lever from 1 to 2 and so on. Heck, the GP even in auto mode would downshift pretty quick when going wot, unlike the G.
I've had 4 automatic GM cars and 2 automatic G35's and the G35's shift much slower than the GM cars ( one of the GM cars was a cavalier..lol ).
I've had 4 automatic GM cars and 2 automatic G35's and the G35's shift much slower than the GM cars ( one of the GM cars was a cavalier..lol ).
#74
10-07-2009, 11:15 PM
Those autos you speak of are tall geared 4ATs. My 94 Z28 4AT was the same way. GM does make a really good auto; however, the G has a fairly deeply geared 5AT. Let me explain. With the additional gears and gearing, the shift programming is such that the TCM/ECU needs to determine the correct gear for the situation as to not overload the chassis, much less most drivers. That means taking into account throttle position, braking, g-load, vehicle position, etc. I've rented quite a few of the newer GM models with the 6ATs and those trannies are far less responsive than the old 4ATs or even the JATCO 5AT. Manual upshifts and downshifts are lazy because the tranny has to do a lot of deciding with regards to the right gear for the moment. With that said though, those 6ATs are well geared and make cars like the I4 Malibu quite nice driving cars assuming you're not in manual mode.