DeWitts Fans - Performance & Wiring ???
#1
Burning Brakes
Thread Starter
DeWitts Fans - Performance & Wiring ???
My SC'd C6 is not liking these Florida temps, even with the DeWitts radiator. Now I've gone and melted my fan connector so it's obviously time to upgrade.
The ProSpeed setup is nice with all of the wiring plug & play, but not for $500 more, and their PWM controller is (sorry Prospeed!) nothing more than a $30 solid state relay so no huge added value there. So I'm leaning towards the DeWitts which they say can re-use the stock controller, or make my own if necessary.
Does anyone have any real-world experience on the performance of these units on a car with an A2A intercooler in front of the rad? Leaning towards the DeWitts for less than 1/2 the price but am I missing something?
The ProSpeed setup is nice with all of the wiring plug & play, but not for $500 more, and their PWM controller is (sorry Prospeed!) nothing more than a $30 solid state relay so no huge added value there. So I'm leaning towards the DeWitts which they say can re-use the stock controller, or make my own if necessary.
Does anyone have any real-world experience on the performance of these units on a car with an A2A intercooler in front of the rad? Leaning towards the DeWitts for less than 1/2 the price but am I missing something?
Last edited by Pete2k_Z28; 06-16-2019 at 01:31 PM.
#2
Instructor
I went with the ProSpeed and it works great out here in Az Heat. From what I read those other setups don't cool well so that's why I spent the money on the ProSpeed.
#3
Burning Brakes
Thread Starter
#4
Instructor
#5
Burning Brakes
Thread Starter
#6
Team Owner
Not even close to the same fans. Even though both are Spal, one is like a Chevy Cobalt, the other a Corvette.
You are better off just fixing you fan connector than downgrading, unless you goto the prospeed setup.
The "Dewitts" setup uses normal high performance spal fans rated at 525cfm at 25 mm pressure.
The Prospeed uses extreme performance spal fans rated at 1074cfm at 25mm pressure.
That is more air flow from one of the prospeed fans than both fans on the dewitts system. There is a reason is it cost more.
You are better off just fixing you fan connector than downgrading, unless you goto the prospeed setup.
The "Dewitts" setup uses normal high performance spal fans rated at 525cfm at 25 mm pressure.
The Prospeed uses extreme performance spal fans rated at 1074cfm at 25mm pressure.
That is more air flow from one of the prospeed fans than both fans on the dewitts system. There is a reason is it cost more.
Last edited by Unreal; 06-16-2019 at 05:21 PM.
#7
Burning Brakes
Thread Starter
Not even close to the same fans. Even though both are Spal, one is like a Chevy Cobalt, the other a Corvette.
You are better off just fixing you fan connector than downgrading, unless you goto the prospeed setup.
The "Dewitts" setup uses normal high performance spal fans rated at 525cfm at 25 mm pressure.
The Prospeed uses extreme performance spal fans rated at 1074cfm at 25mm pressure.
That is more air flow from one of the prospeed fans than both fans on the dewitts system. There is a reason is it cost more.
You are better off just fixing you fan connector than downgrading, unless you goto the prospeed setup.
The "Dewitts" setup uses normal high performance spal fans rated at 525cfm at 25 mm pressure.
The Prospeed uses extreme performance spal fans rated at 1074cfm at 25mm pressure.
That is more air flow from one of the prospeed fans than both fans on the dewitts system. There is a reason is it cost more.
#8
Team Owner
PDF with flow specs are on spals site.
#9
Burning Brakes
Thread Starter
Thanks again, I see there is quite a big difference between the Spal "dual fan" https://webstore.spalusa.com/content...02052_SPEC.pdf and their highest rated 11" fan https://webstore.spalusa.com/content...02800_SPEC.pdf
That said, the "dual fan" (setup that DeWitts uses) is 2720 CFM base flow vs. factory which from what I gather is 1600-1700 CFM. I'm not arguing with your experience, and I absolutely agree the Prospeed setup is more efficient, I just want to understand how a fan with 1,000 more CFM than stock is downgrading. Of course I'm going from baseline flow vs. baseline flow because I cannot find a gradient chart for the stock fan, though I would assume it's rather poor since it's an open construction shroud.
I don't mind spending the money if I "need" to, but there's no point in spending money for more than I need, especially when you consider the Prospeeds may also require an alternator upgrade as well.
That said, the "dual fan" (setup that DeWitts uses) is 2720 CFM base flow vs. factory which from what I gather is 1600-1700 CFM. I'm not arguing with your experience, and I absolutely agree the Prospeed setup is more efficient, I just want to understand how a fan with 1,000 more CFM than stock is downgrading. Of course I'm going from baseline flow vs. baseline flow because I cannot find a gradient chart for the stock fan, though I would assume it's rather poor since it's an open construction shroud.
I don't mind spending the money if I "need" to, but there's no point in spending money for more than I need, especially when you consider the Prospeeds may also require an alternator upgrade as well.
#10
Team Owner
You shouldn't look at unrestricted flow because fans are used unrestricted. So quoting numbers for when there is no radiator or ac condenser or fmic doesn't mean anything. Plenty of people have seen increased temps with those fans. I fell for that trap. Real world results show they don't cool as well.
The only other upgrades are 17" nuova fan for $750-800 or dual pwm nuova setup but that is $1300+. Prospeed is very good price compared to competition.
If $1500 for fans and alternator is even something to think twice about then a blown Corvette maybe not for you. That's a minor drop in the bucket compared to the drivetrain, fuel system and other parts needed for a car at this level.
The only other upgrades are 17" nuova fan for $750-800 or dual pwm nuova setup but that is $1300+. Prospeed is very good price compared to competition.
If $1500 for fans and alternator is even something to think twice about then a blown Corvette maybe not for you. That's a minor drop in the bucket compared to the drivetrain, fuel system and other parts needed for a car at this level.
Last edited by Unreal; 06-17-2019 at 12:02 PM.
#11
You shouldn't look at unrestricted flow because fans are used unrestricted. So quoting numbers for when there is no radiator or ac condenser or fmic doesn't mean anything. Plenty of people have seen increased temps with those fans. I fell for that trap. Real world results show they don't cool as well.
The only other upgrades are 17" nuova fan for $750-800 or dual pwm nuova setup but that is $1300+. Prospeed is very good price compared to competition.
If $1500 for fans and alternator is even something to think twice about then a blown Corvette maybe not for you. That's a minor drop in the bucket compared to the drivetrain, fuel system and other parts needed for a car at this level.
The only other upgrades are 17" nuova fan for $750-800 or dual pwm nuova setup but that is $1300+. Prospeed is very good price compared to competition.
If $1500 for fans and alternator is even something to think twice about then a blown Corvette maybe not for you. That's a minor drop in the bucket compared to the drivetrain, fuel system and other parts needed for a car at this level.
#12
My SC'd C6 is not liking these Florida temps, even with the DeWitts radiator. Now I've gone and melted my fan connector so it's obviously time to upgrade.
The ProSpeed setup is nice with all of the wiring plug & play, but not for $500 more, and their PWM controller is (sorry Prospeed!) nothing more than a $30 solid state relay so no huge added value there. So I'm leaning towards the DeWitts which they say can re-use the stock controller, or make my own if necessary.
Does anyone have any real-world experience on the performance of these units on a car with an A2A intercooler in front of the rad? Leaning towards the DeWitts for less than 1/2 the price but am I missing something?
The ProSpeed setup is nice with all of the wiring plug & play, but not for $500 more, and their PWM controller is (sorry Prospeed!) nothing more than a $30 solid state relay so no huge added value there. So I'm leaning towards the DeWitts which they say can re-use the stock controller, or make my own if necessary.
Does anyone have any real-world experience on the performance of these units on a car with an A2A intercooler in front of the rad? Leaning towards the DeWitts for less than 1/2 the price but am I missing something?
#13
Burning Brakes
Thread Starter
You shouldn't look at unrestricted flow because fans are used unrestricted. So quoting numbers for when there is no radiator or ac condenser or fmic doesn't mean anything. Plenty of people have seen increased temps with those fans. I fell for that trap. Real world results show they don't cool as well.
The only other upgrades are 17" nuova fan for $750-800 or dual pwm nuova setup but that is $1300+. Prospeed is very good price compared to competition.
If $1500 for fans and alternator is even something to think twice about then a blown Corvette maybe not for you. That's a minor drop in the bucket compared to the drivetrain, fuel system and other parts needed for a car at this level.
The only other upgrades are 17" nuova fan for $750-800 or dual pwm nuova setup but that is $1300+. Prospeed is very good price compared to competition.
If $1500 for fans and alternator is even something to think twice about then a blown Corvette maybe not for you. That's a minor drop in the bucket compared to the drivetrain, fuel system and other parts needed for a car at this level.
Thank you for sharing your experience.
#14
Team Owner
Sorry if I came off harsh there. Just seen it too often lately as price on these cars come down too many people think a 609; hp reliable Vette is nothing but a 5000 blower.
Prospeed fans work and are proven in the most extreme environment and setups. Too many people including myself bought the spal dual and noticed a rise in temps.
Prospeed setup is buy once hurt once. I bought spal dual, ran hotter. Lost $300 on them as you are lucky to sell for $200 of that and then spent $800 on 17" fan setup. Prospeed wasn't out at the time 6 years ago otherwise would have went that way.
Prospeed fans work and are proven in the most extreme environment and setups. Too many people including myself bought the spal dual and noticed a rise in temps.
Prospeed setup is buy once hurt once. I bought spal dual, ran hotter. Lost $300 on them as you are lucky to sell for $200 of that and then spent $800 on 17" fan setup. Prospeed wasn't out at the time 6 years ago otherwise would have went that way.
Last edited by Unreal; 06-17-2019 at 12:30 PM.
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Dimewise (06-25-2019)
#15
Burning Brakes
Thread Starter
Sorry if I came off harsh there. Just seen it too often lately as price on these cars come down too many people think a 609; hp reliable Vette is nothing but a 5000 blower.
Prospeed fans work and are proven in the most extreme environment and setups. Too many people including myself bought the spal dual and noticed a rise in temps.
Prospeed fans work and are proven in the most extreme environment and setups. Too many people including myself bought the spal dual and noticed a rise in temps.
#16
Team Owner
Plus anything that just uses stock fan plug and wiring will be amp limited. I wouldn't consider anything that doesn't run new power wires and fuses direct to power source. I think maybe the spal dual fans could flow better than stock if you redid all the wiring and ran new fuses and power wires but both fans being fed off the single small wire probably limits them. 17" and prospeed just use the signal for pwm and then are new power setups directly to fuse box.
#17
Burning Brakes
Thread Starter
Plus anything that just uses stock fan plug and wiring will be amp limited. I wouldn't consider anything that doesn't run new power wires and fuses direct to power source. I think maybe the spal dual fans could flow better than stock if you redid all the wiring and ran new fuses and power wires but both fans being fed off the single small wire probably limits them. 17" and prospeed just use the signal for pwm and then are new power setups directly to fuse box.
#18
Melting Slicks
I opted to go with these guy's coupled with the Dewitts radiator I do not go over 201 here in FL. Yes it is more expensive than the other guys but it is well worth it IMO.
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erikszr1 (07-28-2019)
#19
Team Owner
Another great option is to get out of Florida. That would be my choice of what to do in this situation
#20
[QUOTE=Unreal;1599597922]Another great option is to get out of Florida. That would be my choice of what to do in this situation [/QUOTE
Hey, we get nice weather about 4 months out of the year, come on now.I see you are in Arizona, land of the 100+ temps, but I hear it's a "dry heat" so its not that bad, lol.... Seriously though, its been hot as f*ck way to early this year. My home ac unit could not even keep up, and it is a fairly efficient set up. Between keeping the house cool and the Z cool , its a real task !!
Hey, we get nice weather about 4 months out of the year, come on now.I see you are in Arizona, land of the 100+ temps, but I hear it's a "dry heat" so its not that bad, lol.... Seriously though, its been hot as f*ck way to early this year. My home ac unit could not even keep up, and it is a fairly efficient set up. Between keeping the house cool and the Z cool , its a real task !!