Supercharged Trailblazer 4200 I6
- Thread starter bruhaba
- Start date
5th tube fit. Cylinder one is the only one left.
Full custom exhaust all the way back. Single 3"...Flowmaster SUV muffler and stainless tubing. I'll put a v band right at the end of the header. It will be the last thing after trial fitment.
Motor mount access should not be a problem.
Motor mount access should not be a problem.
Because that would be too loud and obnoxious for me. Been there, done that. These days I'm all about subtle and getting it right. This will be loud enough for me I'm sure.
ScarabEpic22
Member
- Nov 20, 2011
- 728
Finished the header with the exception of coating and heat shielding. I'll wait to weld the V band on until I check fitment. This sucker better fit! I did this all by eyeballing it on the engine stand!
Mounce
Member
HARDTRAILZ
Moderator
- Nov 18, 2011
- 49,665
BlazingTrails
Member
- Apr 27, 2014
- 19,409
Truck is running perfect. Only issue that has come up is the supercharger belt stretched a bit and the serpentine tensioner I designed in to the belt path ran out of travel so the tensioner rattles a little at about 900 rpm.
I'll answer the MPG question even though it goes against my reason for existence on earth which is to burn GAS! When I first added the supercharger the MPG went from 15/22 to 15/20. Then I changed to the 4.10 rear with the supercharger and that absolutely killed it. It's at about 13/17 which I think is about what a trailblazer SS does so that makes some sense to me. I do not drive with a light foot.
The header fits perfectly! Can't tell you how happy I am about that as I pretty much took a lot of measurements with a tape measure and tried to mock them on the engine stand. It worked because the header fits like a glove and the outlet is in just the right spot!
The rear exhaust manifold bolt was broken before I even touched it and the front one was finger tight; both were leaking. Unfortunately the broken one is flush in the head. What a pain. That is probably the little "rattle" that I've been hearing for a while at a certain load speed that I thought was a heat shield somewhere but could never find. I've spent a bunch of time drilling this thing and screwing around cutting stubby drill bits to get in there. EZ out wouldn't budge it so I drilled it. Heli coil going in.
More to come in a few weeks on the rest of the winter upgrades!
I'll answer the MPG question even though it goes against my reason for existence on earth which is to burn GAS! When I first added the supercharger the MPG went from 15/22 to 15/20. Then I changed to the 4.10 rear with the supercharger and that absolutely killed it. It's at about 13/17 which I think is about what a trailblazer SS does so that makes some sense to me. I do not drive with a light foot.
The header fits perfectly! Can't tell you how happy I am about that as I pretty much took a lot of measurements with a tape measure and tried to mock them on the engine stand. It worked because the header fits like a glove and the outlet is in just the right spot!
The rear exhaust manifold bolt was broken before I even touched it and the front one was finger tight; both were leaking. Unfortunately the broken one is flush in the head. What a pain. That is probably the little "rattle" that I've been hearing for a while at a certain load speed that I thought was a heat shield somewhere but could never find. I've spent a bunch of time drilling this thing and screwing around cutting stubby drill bits to get in there. EZ out wouldn't budge it so I drilled it. Heli coil going in.
More to come in a few weeks on the rest of the winter upgrades!
Tiggerr
Member
04GTP
Member
- May 30, 2015
- 1
New member here and this is my first post. I also own an 04 GTP hence my name. Would an Generation V M90 from a GTP work with this setup? Gen 3 M90's came on the 97-03 GTP's and Gen V M90's came on 04 and 05 GTP's and Comp G's. I'm interested upon seeing this to try and make one of them work on my 03 Voy 4.2L. You can PM me if youd like and if there's groups on FB like there is for the Grand Prix groups,I'll go join them. Sorry for spooling up and old thread but this is very interesting to me and I'd seriously like to look into doing something like this. Any help is greatly appreciated!
04GTP,
You can make whatever you want work...with a lot of work. You need to recognize that you will need to build absolutely everything to duplicate my setup. I used a mill, lathe, drill press, bandsaw, tig welder, tap and die set etc...takes a lot of resources.
The only thing original in my engine bay is the long block! M90 won't have enough steam in my opinion for these motors. I've done lots of calculations and ended up using an m112 and it is spinning pretty fast as is.
Good luck,
Chris
You can make whatever you want work...with a lot of work. You need to recognize that you will need to build absolutely everything to duplicate my setup. I used a mill, lathe, drill press, bandsaw, tig welder, tap and die set etc...takes a lot of resources.
The only thing original in my engine bay is the long block! M90 won't have enough steam in my opinion for these motors. I've done lots of calculations and ended up using an m112 and it is spinning pretty fast as is.
Good luck,
Chris
no, it's still in there. I just don't use 4wd. Won't be able to pull it out until I'm ready to convert the trans to a 2wd output shaft and tailhousing. Not real high on my priority list
You can run it as 2wd, just have an annoying light. Ask me how I know. I need your diff to replace mine that got destroyed.
Finished the header and working on the full exhaust. Had Airborn ceramic coat it. A couple weeks it will finally be back on the road. I have no time these days!
Tiggerr
Member
gmcman
Member
- Dec 12, 2011
- 4,673
Freakin awesome.....that's a work of art. Hold your head up high.bruhaba said:Finished the header and working on the full exhaust. Had Airborn ceramic coat it. A couple weeks it will finally be back on the road. I have no time these days!
Gerbil21
Member
- May 28, 2014
- 839
Damm that really is a beautiful made header, any interest in making more?bruhaba said:Finished the header and working on the full exhaust. Had Airborn ceramic coat it. A couple weeks it will finally be back on the road. I have no time these days!
I'm shure people would love to be able to buy good headers for a good price especially since it would be the only one for sale lol.
Maybe you can talk to the guy who's running the trailblazer rs 2.0 project he has a whole shop and people to fab parts, if you were to work with him maybe trailvoy owners will have some hope
Blckshdw
Moderator
Gerbil21 said:
Not exactly...http://www.kooksheaders.com/amfinder/?find=2005-chevrolet-trailblazer-inline-6-i6-4-2-329362
BlazingTrails
Member
- Apr 27, 2014
- 19,409
Yeah I'm pretty sure hiring a shop to one off a few manifolds would cost much more that the kooks header. Also it took the op like a year to finish it because he is a very busy fellow, so I doubt he is willing to build any more.
It is a bad ass header, I would like one myself.
It is a bad ass header, I would like one myself.
Gerbil21
Member
- May 28, 2014
- 839
Well yes I know it won't be the only one for sale but that header isn't even worth it at that price, i5 owners have a list of headers to choose from, we have one you have to pay a whole bunch for that dosent come out worth it so I don't consider it a choiceBlckshdw said:
I would rather use that money for a port job, 08 manifold and a diy cai
BlazingTrails
Member
- Apr 27, 2014
- 19,409
I'm not sure if you know but I did the 08-09 Manifold on mine and I don't believe a kooks header could flow any better than that. It has much larger ports and a high flow design. I could tell a big difference after installing it. I had to go back and adjust my tune after installing it.Gerbil21 said:
BlazingTrails
Member
- Apr 27, 2014
- 19,409
Well that sounds nice in theory, but it is impossible to produce parts and sell them at low prices, until you are mass producing thousands. There is not a big enough market to do that, if there were the big companies would already produce them. Why do you think you can build a 600 HP civic for like 2k? Because there are millions of ricers building civics. It just simple business bro. Supply and demand, If there is no (or little) demand there is no supply. Not without spending a significant amount of money. 
Gerbil21
Member
- May 28, 2014
- 839
I am aware of that, I actually read that thread after seeing this post of the headers lol, I was thinking of doing that too but that would be more work since it required the cat's pipe to be shortened, the 06 header should be a easy plug and play swap even though and have the same O2 sensor position and the 02-05'sBlazingTrails said:
BlazingTrails
Member
- Apr 27, 2014
- 19,409
Well I have had all three of the Manifold at one time or another and the first 2 have no significant differences to be honest. It's not worth buying unless you need a replacement. I am really glad that I did the 09 because it looks better, runs better, and has not cracked yet. The 06 Manifold only lasted 13 months.Gerbil21 said:
gmcman
Member
- Dec 12, 2011
- 4,673
The trick is to get the 06+ heads which have alot more meat in the ports and can be ported much more than the earlier head. Couple that with a set of custom cams and I believe the average net is 40-50 HP.
Gerbil21
Member
- May 28, 2014
- 839
Yes the heads are where the power really is, which is why 06 engines are perfect, since they have the new design but they also swap right into 02-05. Also as proven with the engine dyno of altered222's engine with 8.3 cr pistons and cams it made 350hp I would only imagine with stock 10:1 cr it would be a good bit moregmcman said:
Well i know the 08+ manifolds are the best but I dose require cutting and welding, something that most people don't have or atleast I don't [emoji26]BlazingTrails said:
Thanks for the kind words guys. Bottom line is there is no way to do this at a profit in low volumes unless prices of finished components are equivalent with Ferrari aftermarket parts. After I built this I was thinking what a deal the kooks header is. Still glad I did it because the collectors I have are true merge, it's 1-3/4 tubing and ceramic coated. Plus I don't like having stuff others can buy! I would have bought a camaro ss and bolted on a supercharger kit from a box in a weekend if that was the case. (I'm not digging on that setup, I'd love to have that). I just get a lot of satisfaction out of building stuff.
Sparky
Member
- Dec 4, 2011
- 12,927
There's just something about doing it yourself that is just so satisfying.