DHP down shifts.

Posted: Tue Jun 12, 2007 11:01 am Post subject: DHP down shifts.

My 98 GTP has a DHP 1.5 PCM in it with a bit higher (6000 rpm) shift point then normal for a 1.5. Other then that, it's a DHP cookie cutter unit.
The shifts suck, esp. the lack of double down shifts. My Intense PCM I had before I foolishly traded it in on this DHP had awsome transmission control.
Has any body changed the shift perameters on their DHP 1.5 ? My car will only downshift 1 gear, like a stock PCM.
Also, has anyone used a ZZP PCM, if so, how was the shifting?
_________________
2001 Silver GTP coup 11.880@116.17 Fun Driver
1998 SilverMyst GTP sedan 13.716 Sold
2010 Black Camaro Daily Driver
1969 Firebird convertible 455 FUN

Posted: Wed Jun 13, 2007 9:40 am Post subject:

Doug, is it a DHP 1.0 or 1.5? A 1.5 file is just a starter file, nothing crazy about it. Matter of fact Ive never liked DHP's transmission settings.

I am currently rocking a custom bin that started off as a ZZP file. So far I like the way the transmission shifts, 1st to 2nd is firm enough to feel. I don't do skips shits or WOT down shifts so I cant commend on those. I do have line pressure turned up, not all the way but more than stock.
_________________
'08 TrailBlazer SS Black/Black

Posted: Wed Jun 13, 2007 10:19 am Post subject:

Its a DHP 1.5. I may be getting help today from Brian and Larry. I will post results here.

Posted: Wed Jun 13, 2007 10:35 am Post subject:

alright well good luck and post up results.

Posted: Wed Jun 13, 2007 7:45 pm Post subject:

Brian and Larry helped me out today by loading Brians current shift settings he uses into my PCM. It is better then what I was living with. Now I get my double downshifts, but it is still not as aggresive as the Intense PCM. I can live with this shift setting, thanks for your help guys Smile

Posted: Wed Jun 13, 2007 7:46 pm Post subject:

Glad it worked out Doug!
_________________
2018 Acadia
Retired: 2014 ATS, 2004 GTP

Posted: Wed Jun 13, 2007 8:37 pm Post subject:

Posted: Wed Jun 13, 2007 8:49 pm Post subject:

Doug I have the Intense bin if you want the shift settings.
_________________
Good Bye.
BHO sucks.

Posted: Wed Jun 13, 2007 9:28 pm Post subject:

the intense bin that you have, is that an hptuner file or powrtuner?

if it is an hptuner file could you send it my way? I have mine set but i'm not happy with it... it shifts hard when on perf, but I think i need to turn the pressures up a lil more.

Posted: Wed Jun 13, 2007 9:30 pm Post subject:

glad its getting better doug, but that trans didnt fell that hot to me. I was scard do do a doulbe downshift with it.
_________________
New Era performance

01z28, M6 NA, mullet, T tops, siqqqq

Posted: Thu Jun 14, 2007 7:05 am Post subject:

John, The tranny is fine, except that it had a DHP PCM with poor shift settings in it. It now has enough line pressure and correct settings to make the shift happen now, instead of taking a second or so. When I went from the Intense PCM to the DHP 1.5 the shifts were very slow. I got no response to my email from them and within 2 months the tranny was sliping so bad I changed it for the one in it now, which is a good tranny from a GTP with barly 50 k on it. With the very slow shifts the DHP was commanding I guess not having double downshifts was a good thing.
Now, with Brians shifting table the shifts are quick and resonably firm, not like a shift kit firmnes, but good enough. The tranny is acting like it should, and it now double down shifts at WOT, as it should have with a after market PCM.
Carl, thanks for your offer of the Intense shifting info, I will PM you Very Happy

. I liked the Intense PCM command of going from 4th (cruising) to 1st at WOT if it was at like 45mph or so.
I won't say the DHP PCM made my original tranny fail, but it sure as hell didn't help it, slow shifts when you are making lots of power can't be a good thing for the frictions in a tranny. My fault though for not doing this sooner.
Thanks again everyone Very Happy

Posted: Thu Jun 14, 2007 7:17 am Post subject:

Posted: Thu Jun 14, 2007 10:22 am Post subject:

Posted: Thu Jun 14, 2007 10:25 am Post subject:

Posted: Thu Jun 14, 2007 10:28 am Post subject:

pm sent... thanks Smile

	Upstate New York Club Grand Prix Forum Index -> PCM / Tuning	All times are GMT - 5 Hours Goto page 1, 2 Next
Page 1 of 2