Alfa Supercharged and turbocharged - Phase 2 - Refining the platform

[gtv27]

That evo bonnet is pretty much what I was thinking but thought it might be easier to do via an add-on part - hence reference to the group A walkinshaw (picure incl for our international friends who may not be aware of this oddity for group a touring car racing in the early 90s) - I'm sure that the bonnet scoop would be available aftermarket. You might be able to pull some cold air for the intake front the rear also.

[ducatibruce]

Do it yourself aero, with wool tufts Browser Warning or a gauge Browser Warning

[buzzed]

Quote:

Mike have you even seen Pauls EVO bonnet on his turbo charged GTV ?

[buzzed]

Hiya Bruce, yes, I'm not scared of do it yourself aero, could not be easier with the good old string trick.

The group A bonnet net would need some tweaking as it would be to wide. I actually had a pretty decent search for after marked bonnet bulges and found nothing I liked (or they were too wide for the bonnet). I REALLY like the Evo bonnet and a bit of do it yourself aero would sort out whether it's functional as well. I'm very keen to go understated rather than in your face.

[alfahaka]

Totally OT - except that as wild mods to alfas go these are up there:

If a Walkie needs explanation (the poms should at least know who he is?), I suppose I should explain the chook lotto reference too... It is one of these...



Its a bit hard to see behind KP (who is obscuring the real name "Giocattolo" in big letters above the sills) - here's one where you can see the bonnet better...



It has an Sud Sprint chassis and the same engine as the Walkie with the engine where the back seat should be, allowing some interesting front end aero where the engine should be.... This is the business part of the package....

[buzzed]

I almost bought a Giocattolo about 5 years ago, turns out I don't fit! Grrr. You are right, kinda need to move the engine to get that aero happening, I'm chewing over variations on the last one. Also I found this aftermarket fan shroud, doubt I'll be able to get it to fit, but I have some other ideas that this conversation about cooling has sparked for me that should improve matters, starting with proper sealing against the panel work.

[Storm_X]

I think Paul is his name. He has the silver GTV 1.8 with mono liners and has like 230 rwkw. I'm sure you have seen it

[buzzed]

Ahh yeah I have seen it, but you referred to an Evo bonnet...that's a group 4 bonnet or something like that I think. He imported it specially...cost 5k imported I heard. A bit in your face for me but still cool

[Storm_X]

Not my cup of tea at all, 5k? No thanks.

[BradGTV]

i would have thought the turbodelta louvers would suit your car much better being a gt, the simmons give a nice modern look to the classic styling, but these bonnet scoops are looking a little ricer ' ish ?

[buzzed]

Haha, yes, they are all hideous, hence why I have not run out and done anything, and yes, turbodelta style vents are still my preference. Failing that, I guess I could vent the inner guards like on the turbodelta and then put a small fan in each that kicks in below 60km/hr or something like that.

[alfahaka]

If your issues are largely with low speed/stationary cooling I think the big scoops and fancy schemes including what I was trying to get at with the chook are irrelevant, quite aside from the ugly factor.

It sounds like you are on the right track with sealing around the radiator and ducting to make sure the flow you do have is pulling as much cold air in as possible and not letting the hot air it draws through and blows (the stuff already under the bonnet) to get back around the radiator. If you can also cool then really hot bits directly with turbodelta-style vents with some baffling to try to "encourage" the turbo/exhaust heat to use the vent thats probably enough?

[ducatibruce]

Turbodelta vents get my aesthetic vote too (maybe with a fan under the bonnet to push a bit more air out at low speeds).
Try to put the vents over the hottest engine bay components where the pressure differential works to exhaust at speed - if the pressure differential at speed makes it an inlet it may reduce radiator efficiency there due to reduced pressure differential across the rad.

Edit to add: If the radiator is marginal at low speed you could try water mist cooling of the radiator. A couple of garden type sprays & a windscreen washer pump & you're good to go. Worked nicely years ago on a Lotus that wanted to lunch the motor at the mere thought of sitting on the grid. Though we did get black flagged once due to steam - flaggies thought it was a leak

[gtv27]

shocked to see a photo of my old mate KP on here - you should tag that as NSFW

I liked the last bonnet option. Looked very neat. However, reflecting on the problem, all you are really wanting to do is create a 'chimney' for the heatedair to escape after exiting the radiator...simily cutting any sort of hole and putting some mesh over it will do that. The aero issue is redundant as the car is stationary and relying on the fans at this point. IIRC early WRXs had some neat vents that probably could be grafted in fairly easily.

[Biba69]

I did a fairly quick skim, but got all the way to the end of the wool tufts and meter gizmo and both seem a good way to decide where the vent/vents should go.

Visually I like the last one just above, with the cut panel, then folded down. True the center reinforcement piece would need to be cut. My thinking is if there is a way to vent at least some of the heat from the radiator before it makes its way to the rest of the engine bay, it would definitely be a step in the right direction.

Not your situation but my pretty stock Alfetta GT doesn't like to sit in traffic either, so with papajam's help I can turn off the A/C, but independently turn on the A/C push fan (along with the engine bay pull fan). It is even set up to run with the engine off in case I have to pull over.

It goes without saying that the first thing to do is pop the hood/bonnet latch when caught in heavy traffic. I've driven at speeds with it popped open (of course still partially latched) without any problems.