chrisLT1

Ok so I took my car to AMP in Arlington and got the tune done after putting in the stall (3200 circle D) and it did 325hp so I decided to let 21st CMC do my cam and head swap (228/232 113lsa with stage 2 243 heads) and only pulled 340 FREAKIN HP!!!!!! should I question this I haven't taken to the track yet but im not very pleased with the numbers im pretty sure they both use a dynojet

mod list:
LTs ORY pipe 3200 stall made 325hp
added 228/232 113lsa with stage 2 243 heads and gained 15hp?????

what do you guys think? im pretty sick with the whole situation

imma_stocker

iTrader: (19)

Your car was on two different dynos in different conditions, don't read too much into that. Was converter locked or unlocked on each pull? Was it raining either day? Are you on a break in tune?

What does the butt dyno say?

chrisLT1

Im not sure about the first time but the second time the stall was unlocked they said don't think it was raining but maybe humid that day shouldn't have been a break in tune he was even shocked it didn't make better numbers I haven't picked it up yet they claim its running good but not feeling the 15hp pickup

5w20

iTrader: (21)

Interesting.

chrisLT1

Anyone else ever have anything like this? freakin out a lot of cash for so little result!!

green94z

iTrader: (6)

Cam and head car should make 400 plus imo

chrisLT1

thats what I thought im thinking its in my tune that's off surging pretty bad at idle even with a stall and cam motor shakes pretty hard at idle I know it has a cam but never really seen one shake like that

Dirty 30

iTrader: (96)

Sam88gta1 is the owner of AMP. I'm sure he will chime in soon. Perhaps the car has fueling issues or other issues that need to be resolved? Have you talked to 21st Century to see if they dyno'd it after they did the H/C swap?

codyvette

iTrader: (24)

Dyno numbers very here and there but if the dyno is close to accurate, those numbers are horrible. My 216/220 cam and bolt on car made 353 with a student tune when I was at the tuning school. A tune can't make up for something wrong though. I would double check all of that before I start to point fingers. Did you upgrade your fuel pump or add a hotwire kit. I have found this to be very important in most cam/and even bolt on builds.

00pooterSS

iTrader: (40)

Something is wrong, tell them to figure out what it is, if they can't then maybe ask them to refund the tune part of the amount you paid or the whole amount since it could be an install error.

chrisLT1

Im trying to get ahold of the guy (sam at AMP) that usually does my tuning to see if he will check it out or retune this damn thing hopefully soon I want to hit the track this weekend! and no ive done no upgrades to the fueling of the car

chrisLT1

Or can someone chime with suggestions on another reputable tuner in DFW?
really want to have a second look at this tune

neutron82

iTrader: (26)

hmm, this is the 2nd case I have heard of in the last couple of weeks from 21cmc... ran into a guy on the vette forum that had a cam installed by them and it was making a whistling noise afterwards, almost sounded like it had a blower on it... the guy told me they were swapping the cam out for him but I haven't followed up with him to see what all went down... if you were happy with AMP why didn't you take it back to them for the h/c install?... if you feel more comfortable with them I would take it back and have him tune it, since you previously had a tune he shouldn't charge you full price to clean it up... have him run a baseline of where it is now to see what his dyno reads so you have a before and after to compare

00pooterSS

iTrader: (40)

Maybe 21st has a new tech that sucks. It happens. If so get them to have another employee check it out.

neutron82

iTrader: (26)

this is possible but to my knowledge Matt is still doing the tuning over there so wouldn't part of it fall in his hands?... they seemed like nice people the times I have talked to them, you would think they wouldn't let a car with potential problems leave the shop before it was addressed or at least inform the customer that something needs to be fixed before they can move forward

00pooterSS

iTrader: (40)

Agreed, and I believe he stated he hasn't picked it up yet. They are a larger name outfit and I'm sure they didn't get that name by screwing people, so I would bet it gets resolved. OP try to not get too worked up, if you haven't picked it up yet they likely aren't done trying to resolve the issue.

chrisLT1

I dint go to AMP because they were full at the time and had along wait if I could get ahold of AMP I will take it to them but need to get something done asap because something just doesn't feel right the car is also surging really hard at idle and low rpms not sure what to make of it

and by the way 00pooterSS I picked it up this morning and its something just don't feel right

chrisLT1

Just to clear it up im not knocking 21st CMC or matt(he is the one that tuned it) yet want to get a second opinion on the tune it could be something I need to fix on my end but I have driven enough bolt on tuned cars to know that something itsnt right

chrisLT1

top one is before H/C install dyno at AMP and bottom is with H/C at 21st CMC and I actually LOST 24LBS of TORQUE!!!! WTF!!!!!!

chrisLT1

Ok so just made an appointment with Sam at AMP for retune so ill update when all said and done