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im running an aftermarket radiator and cooling isn't an issue. same set up as you.
mine isn't a Dewitts. just a similar aftermarket radiator. I would have gone with a Dewitts but the prior owner/builder already put this one in so I will use it until it springs a leak.
make sure the front of your ac condenser doesn't have trash in it. I had that problem and after using air to clean everything out I have had no cooling issues at all.
Last edited by maybelooking; Jul 2, 2021 at 12:19 PM.
I have a Dewitt’s radiator and while I believe it is a high quality product and as good as there is, it alone is not a be all, end all cure.
Airflow is still key and challenging with a C5 bottom breather.
I recently opened my front license plate area and removed the front metal piece of the shroud from my A&A SC kit to allow direct air flow to my intercooler.
I’m still in the evaluation phase, but my first maiden voyage produced favorable results in reducing IAT’s and coolant temps. My next step will be modding my new ACI front splitter, basically by extending the rear of the tray where it deflects air up to the condenser and radiator. Because of the thickness of the intercooler, there isn’t adequate space for the air to flow properly. The back edge of the strip of painters tape is where the tray/deflector was before it was cut off when my SC kit was installed. Note: even with the center air deflector reinstalled, there just isn’t adequate space for good airflow, between the intercooler and deflector.
^^^ The intercooler is directly above the tape.
I believe extending the rear of the tray 1 1/2” and the gap will much improve airflow up to the condenser and radiator.
In addition, I have a heat extracting hood, so I’m hopeful the increased airflow will not adversely effect aero downforce on the front, but honestly my time in triple digits is and will likely remain pretty scarce, as I do not drive that way on public roads.
Looking GREAT! I love the tips. I agree that the Dewitts is the best radiator out there. How much space do you have between your radiator and intercooler? Having some space for the air to flow is important. Actually the one problem you might have with a Dewitts radiator is that is is actually a bit thicker, so you might have less space for air to flow. I have a custom air box that was part of my A&A kit. This allows for good flow to both the intercooler and the radiator and condenser. My fans are tuned to come on at 199. My temps remained unchanged before and after the supercharger install. I usually run around 200 even in hot weather. I think better airflow is going to be your answer. Looking forward to some more videos and dyno numbers.
I honestly don't have a clue how much space between the radiator and intercooler as I haven't gotten in there to take a look yet. I am planning on taking a closer look tomorrow when I put it up on the quick jack. I hope to at least have some more videos posted soon. Gonna try and get another idle video and a fly by video.
Originally Posted by maybelooking
im running an aftermarket radiator and cooling isn't an issue. same set up as you.
mine isn't a Dewitts. just a similar aftermarket radiator. I would have gone with a Dewitts but the prior owner/builder already put this one in so I will use it until it springs a leak.
make sure the front of your ac condenser doesn't have trash in it. I had that problem and after using air to clean everything out I have had no cooling issues at all.
Good to know, I'll have to do a little more research to try and narrow something down.
Originally Posted by lewislgZ06
I have a Dewitt’s radiator and while I believe it is a high quality product and as good as there is, it alone is not a be all, end all cure.
Airflow is still key and challenging with a C5 bottom breather.
I recently opened my front license plate area and removed the front metal piece of the shroud from my A&A SC kit to allow direct air flow to my intercooler.
I’m still in the evaluation phase, but my first maiden voyage produced favorable results in reducing IAT’s and coolant temps.
I haven't thought about opening up the license plate area. While I don't run a front plate, I'm technically required to and from my understanding there are no more "repair" option in Texas. So I am a little hesitant to cut away anything that would remove the option to put a front plate on. Regardless, I'd be interested in hearing your final thoughts on it.
I was able to drive the car around tonight and man the car woke up. I did a couple of quick 1st gear pulls and then let off before shifting to 2nd. Majority of the pulls were 2nd gear and It just keeps pulling. I have never giggled so much with excitement. Our family headed to a car meet, my 14 year old daughter had a blast riding shotgun with me. And then on the way home my wife and I switched cars, guess who our daughter decided to ride with. I finally was able to hear the car from outside and the spool just makes the car sound like a jet. I did notice that the charge pipes that sticks through the fender liner is hitting the rear tires during suspension travel. I know someone mentioned earlier the car is sagging in the rear which is very apparent from the earlier pics. Tomorrow I'm planning on raising the rear of the car. Rear tire size is 295/40/18 for anyone curious.
You will get everything sorted out, that’s part of the modding process. The main part is and I love hearing it, you and your family are having fun with it. That’s priceless!
Got out in the garage and raised the rear of the car up an inch and it's now 28" from the ground to the center of the rear fender. It is much better now with no charge pipe scrapping/rubbing on the rear tires. GFB boost controller arrived today as well so looks like I have another mini project this week. I opted to go with this particular company due to price point, construction of the product, great reviews, and no boost spike from a variety of testers. But what I like the most is the design of how you have to turn up the boost. The allen key has to be inserted and then you turn the boost up or down. Not that it probably will ever happen, but this will at least help to minimize anyone from just turning the ****.
Do you have your oil pump for the turbos running at one speed? or did you set it up to run slower at idol and faster at WOT??
Mine is set up on a dual speed and the resistor being used keeps burning up. Im thinking about doing away with that set up and just running it on hi speed all the time. My guess is the original installer did this so the pump wouldn't be run at high speed all the time and to give it a longer life.
If you want the system to spool quicker, you would be better off getting rid of the longtubes, put stock manifolds back on, merge them into a y and to a single 2.5" pipe going to the back, and split it back off into individual 1.875 or 2" pipes feeding each turbo. It seems Holley cleaned up the kit a little bit. Cold side piping doesn't seem as large as it used to be. Rear mount setups can work great, and there are plenty of guys spooling larger T6 90mm+ units within a few hundred rpm of the hit. STS unfortunately just made a bad, very inefficient system... Sounds cool, but your 550 hp STS car is going to get walked on by an all motor car that makes 450 wheel.
OP take my advice if you would actually like this system to perform well.. Otherwise, clean car and I hope you enjoy it.
I'm considering doing the STS kit on my 04 Z but using their STS204 ball bearing turbos and keeping it under 600 whp for now to keep the stock internals happy.
I'm considering doing the STS kit on my 04 Z but using their STS204 ball bearing turbos and keeping it under 600 whp for now to keep the stock internals happy.
Never put it on the dyno so no idea what it's making. Boost doesn't hold steady and is intermittent at times. It will go from 6 psi down to 3 then up to 5, then down again throughout the powerband. In the rearmount corvette facebook group a few guys stated they had the same issue and it was resolved with bigger turbos. Regardless, the car is still a blast to drive.
Beautiful car, very nice setup!
I sent you a PM concerning details about that STS rear dual scavenging pump mounting bracket as shown in the photo below that I was able to find.
TIA
Why wouldn't you dyno tune after adding FI? That just seems like you're asking for trouble. I suspect a proper dyno tune might help with your boost issue as well.
I finally was able to hear the car from outside and the spool just makes the car sound like a jet. I did notice that the charge pipes that sticks through the fender liner is hitting the rear tires during suspension travel. I know someone mentioned earlier the car is sagging in the rear which is very apparent from the earlier pics. Tomorrow I'm planning on raising the rear of the car. Rear tire size is 295/40/18 for anyone curious.
