HP tuners questions
HP tuners questions Ok, I'm helping a buddy finish up a 240sx with an LS1 in it. Last night we were discussing the possibility of making individual throttle bodies but have a few questions about tuning. I brought up the fact to him that he already has HP Tuners with a 2 bar MAP and whatnot and can't for the life of me figure out why HPT wouldn't be adequate for sub 500hp on itb's. The owner of the car was talking with someone from aussieland that was at SEMA and displaying a set of throttle bodies who told him HP tuners wouldn't suffice.
I figure as long as it has a good vaccum manifold for adequate signal, and a GM TPS sensor I think it'll work. What can any aftermarket ecu do that a flashed stock ecu can't?
I figure as long as it has a good vaccum manifold for adequate signal, and a GM TPS sensor I think it'll work. What can any aftermarket ecu do that a flashed stock ecu can't?
TECH Apprentice
Joined: Sep 2005
Posts: 334
Likes: 1
Ok, I'm helping a buddy finish up a 240sx with an LS1 in it. Last night we were discussing the possibility of making individual throttle bodies but have a few questions about tuning. I brought up the fact to him that he already has HP Tuners with a 2 bar MAP and whatnot and can't for the life of me figure out why HPT wouldn't be adequate for sub 500hp on itb's. The owner of the car was talking with someone from aussieland that was at SEMA and displaying a set of throttle bodies who told him HP tuners wouldn't suffice.
I figure as long as it has a good vaccum manifold for adequate signal, and a GM TPS sensor I think it'll work. What can any aftermarket ecu do that a flashed stock ecu can't?
I figure as long as it has a good vaccum manifold for adequate signal, and a GM TPS sensor I think it'll work. What can any aftermarket ecu do that a flashed stock ecu can't?
Some aftermarket ECUs let you run in Alpha-N mode (rpm vs. throttle position).
I'd prefer not to use alpha N, I can't imagine a car that would run worse than that. When I was in FSAE we ran our car with just MAP and RPM and it was the least responsive piece of crap i've ever messed with. It worked but not all that great.
Thanks for the advice and replys, I think I'll just try it and hope for the best.
STRICTLY Alpha-N sucks (I also tried it with FSAE and said "screw this" and went back to speed density)...that said, the HPTuners 1-bar enhanced OS has a TPS/RPM multiplier table next to the main VE table...so you can sorta blend both features of Alpha-N and normal speed density...can be useful to get a massive cam to behave at low RPM and low load.
I'm NOT sure if the 2-bar OS has that table added also...but if you're running boost why bother with ITB's? Then you will need a plenum or plenums above the TB's rather than seperate filters...I think it could be a very unique/cool setup...but usually I think of ITB's on an NA setup.
I'm NOT sure if the 2-bar OS has that table added also...but if you're running boost why bother with ITB's? Then you will need a plenum or plenums above the TB's rather than seperate filters...I think it could be a very unique/cool setup...but usually I think of ITB's on an NA setup.
The car itself isn't boosted, I think its just the MAP sensor my friend had laying around when he went to go get it tuned. I'm going to start ordering parts in the next few days. I'll keep people updated on this if there's interest.
